Undead Collector

Grudge - Whenever another nontoken creature
you control dies, Cardname holds a grudge
against target player unless they pay life equal to
the amount of creature cards in your graveyard.
Whenever one or more Zombie creatures you
control attack begrudged player, you may return
target creature from your graveyard to the battlefield under your control with converted
mana cost less than or equal to the number of attacking Zombies creatures.