Walrus Rider can be considered to be a more expensive version of Stealthy Imp, trading 2 additional brains and the lack of Gravestone trait for 1 more strength, 2 more health and Amphibious. The player will most likely find Walrus Rider's Amphibious trait to be a key point when choosing one over the other, as Walrus Rider's increased health is more or less negated by its lack of protection against tricks, and both of the cards have poor stats for their cost anyway. Using this against Solar Flare, Chompzilla, or Captain Combustible can lead to an easy win, due to their lack of Amphibious plants, as long they don't have other means of indirectly harming him.
As a pet fighter, Walrus Rider can also find a place in Template:PvZHLink's pet deck, providing synergies with Cat Lady and Zookeeper. Additionally, Walrus Rider is classified as an Imp, which can also synergize with Imp Commander and Toxic Waste Imp.
Against
If the player is facing against Walrus Rider on the aquatic lane, Template:PvZHLink or Whipvine can use their abilities to move Walrus Rider into another lane, removing him from the aquatic lane and blocking one attack. It is recommended to try and destroy this zombie quickly after, as Sneaky heroes have access to Smoke Bomb to move Walrus Rider back into a aquatic lane.
Additionally, using Template:PvZHLink, Template:PvZHLink (only if Walrus Rider is facing a plant fighter in the same lane as it is) or Sizzle can deal with Walrus Rider easily. You can also use Template:PvZHLink if there are other zombies nearby.
Gallery
Walrus Rider's statistics
Walrus Rider's grayed out card
The player earning Walrus Rider after completing the 8th step in {{PvZHLink|Super Brainz}}' Hero Quest titled "Strange Steed Indeed"