Her design is based on a stereotypical Halloween witch, although her hair resembles that of Frankenstein's bride. She also seems to have some inspiration from Dracula due to her ability to transform into a bat.
Immorticia's name is a portmanteau of "immortal," referring to the fact that she cannot be destroyed but can be knocked out, and "Morticia," referring to The Addams Family character named Morticia Addams.
Immorticia always has a surprise up her sleeve with a vast variety of Tricks, from growing her Zombies or destroying Plants outright!
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Immorticia has a complicated class combination of Brainy and Beastly zombies. This means she has access to both bonus attacks and powerful buffing tricks.
Immorticia has the potential to allow selected zombies to last longer than normal on the battlefield, and consequently deal more damage. A particular example is the Paparazzi Zombie, which has the greatest synergy with Vitamin Z. Playing Vitamin Z on Paparazzi gives it a massive +4/+4 for 3 brains. Likewise, Immorticia can also boost Bullseye zombies such as Pool Shark, causing devastation that her opponent cannot block. Gentleman Zombie also has great use with Immorticia, as he will allow Immorticia to play more expensive tricks early.
As stated by Crazy Dave, Immorticia's classes give her amazing Gargantuar synergy. Her Brainy class gives her access to Wizard Gargantuar and Gargantuar Mime while her Beastly class allows her to use most of the Gargantuar zombies, including Smashing Gargantuar. Wizard Gargantuar gives all Gargantuars Bullseye, while Smashing Gargantuar gives all Gargantuars Frenzy. Both of these two combined can result in a swarm of Frenzy Bullseye Gargantuars in the late-game, posing a huge threat. In fact, if Gargantuar Mime is on the field, it will be even more powerful since Frenzy's ability counts as a Bonus Attack. However, her most deadly combo is Teleport + Zombot 1000, which will destroy all newly played plants and also make Zombot 1000 invulnerable to threats like Squash or Lawnmower. In fact, Immorticia is the only hero who can do it normally without the need of help from cards that can give off-class cards.
However, Immorticia's vast trick disposal is also her hugest downfall. Having tons of tricks is great for a deck, but can also impact it a lot. Fewer zombies can be really bad for a hand, especially in the early game. Plant cards such as Dark Matter Dragonfruit, Brainana and Forget-Me-Nuts can also put a huge dent in her strategies if used frequently. Immorticia players should not try and put every single trick in a deck, as they will clog the deck and likely make a poor deck. However, Haunting Zombie can solve this a bit, as it is a good early game tool to have with decks with minimal zombies.
Another weakness that Immorticia has is that she cannot easily deal with rush decks due to the lack of The Chickening and Weed Spray. She has access to Sneezing Zombie that can help deal with rush decks, but she can only do so much aganist high-health plants. The only thing Immorticia can do in order to deal with rush decks is to fight fire with fire or use early-game stat-lowering cards like Nibble and Extinction Event.
Against[]
Immorticia must be dealt with as early as possible. Beastly heroes need a few turns to truly begin boosting. Her Brainy class helps her do this earlier than others, provided that her important brain-granting zombies survive.
One method is to adapt to her powerful bag of tricks. Distributing buffs evenly between a large number of plants on the board will minimize the value of Locust Swarm and Rocket Science. Putting too many boosts on a single plant makes it a target for the above mentioned tricks. Rushing Immorticia with cheap, high-attack plants such as mushrooms to deal heavy damage is an example of this method.
Another option is to copy her playstyle, buffing or healing plants while preventing zombies from being buffed and removing heavily buffed zombies is effective, although the match may be in a stalemate for a long time. Outsmarting her with your own tricks is also an option, although certain plant heroes may find this method problematic, especially if they are not Smarty heroes.
Smashing Gargantuar gives all your Gargantuars Frenzy, while Wizard Gargantuar gives them all Bullseye. Put them together, and you've got a horde of goliaths with Frenzy Bullseye! Tricks and early blockers keep you alive early so you can play the big guys later.
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Pump It Up
Have you taken your Vitamin Z today? Frenzy Zombies like Energy Drink Zombie, Vimpire, and Interstellar Bounty Hunters are especially good when pumped up so you can run over any opposition and take the fight to the Plant Hero!
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Bag of Tricks
Use Cryo-Brain and Gentleman Zombies to expand your Brains letting you drop early Hail-a-Copters and Maniacal Laughs. Finish them off with a surprise Teleport into a Trickster.
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Brain Lane
Medulla Nebula provides extra Brains when you play Zombies there. Get the most out of this by playing Secret Agents, Yetis, and Energy Drink Zombies that keep the lane free to use again and again!
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Mime Crime
Did you know that Frenzy causes Bonus Attacks? Gargantuar Mime certainly got the memo. All these Frenzy Zombies and Bonus Attacks let Mime put your oppoment into a very special invisible box...a coffin.
Immorticia seems to actually care for her Zom-Bats, as seen in the second comic strip for Menace on Molten Mountain!, where a dead Zom-Bat can be seen falling and Immorticia is holding out her hands to catch it.
Immorticia is the only Beastly hero that doesn't have a pet-based strategy deck.
This is because the only pet cards in the Brainy class are her signature superpower, Witch's Familiar, the zombie it makes, Zom-Bats, Duckstache and Zombot Dinotronic Mechasaur.
She is also the only Brainy hero that doesn't have a science-based strategy deck, despite the Beastly class having the most non-superpower science cards, at 8.
Out of the three, she is the only one that doesn't lead the Sneaky class.
She has access to the second most tricks out of all zombie heroes, at 19, not counting superpowers or token cards, after Professor Brainstorm at 21 tricks.
She also has access to the least number of Gravestone zombies, being only 9. She is also the only zombie hero without access to such zombies that cost 5 or more normally.
The name of Immorticia's Legendary strategy deck, "Bag of Tricks", could be a reference to Crazy Dave telling the player that Immorticia was hoping to "Unleash a bag of tricks" on the player during their first encounter.
Brainy and 
Beastly classes. Her signature superpower is Witch's Familiar, which makes a Zom-Bats on a selected lane. Her closest plant counterpart is Chompzilla.
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for 3 brains. Likewise, Immorticia can also boost 
Bullseye zombies such as Pool Shark, causing devastation that her opponent cannot block. Gentleman Zombie also has great use with Immorticia, as he will allow Immorticia to play more expensive tricks early.
Frenzy. Both of these two combined can result in a swarm of Frenzy Bullseye Gargantuars in the late-game, posing a huge threat. In fact, if Gargantuar Mime is on the field, it will be even more powerful since Frenzy's ability counts as a Bonus Attack. However, her most deadly combo is Teleport + Zombot 1000, which will destroy all newly played plants and also make Zombot 1000 invulnerable to threats like Squash or Lawnmower. In fact, Immorticia is the only hero who can do it normally without the need of help from cards that can give off-class cards.
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Crazy class is the only class that isn't led by a female zombie hero.
Brainy
Crazy
Hearty
Sneaky