Board Thread:Plants vs. Zombies Heroes/@comment-26239911-20170622114417/@comment-5294654-20170622222926

Personally, I think it's a prerequisites mechanic. "You need x card for this card to do y ability", based off the seed packets from pvz1. All of the evolvable cards so far are powerful.

anyways "new" Set 3 Card: Grave Robber Zombie. It's technically been in the game for a while.