Other Zombies you control get +1/+0.

Whenever another Zombie enters the battlefield under your control, put a +1/+1 counter on Champion of the Perished.

Deathtouch Exploit (When this creature enters the battlefield, you may sacrifice a creature.) When Fell Stinger exploits a creature, target player draws two cards and loses 2 life.

Whenever Headless Rider or another nontoken Zombie you control dies, create a 2/2 black Zombie creature token.

As an additional cost to cast this spell, discard a card or pay 3 life. Destroy target creature or planeswalker.

Surveil 1. (Look at the top card of your library. You may put it into your graveyard.) Draw a card.

Look at the top four cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order.

Casualty 1 (As you cast this spell, you may sacrifice a creature with power 1 or greater. When you do, copy this spell and you may choose a new target for the copy.) Counter target spell unless its controller pays {2}.

({T}: Add {U}.)