Then activate the Phantasm with to put it in your library, pop it back out and create two spirits
But if you've got creatures, enchantments, and mana to spare, Vile Mutilator can prove itself to be a blessing in demonic disguise
Full oracle catches things like cycling in searches for card-drawing, or prowess in searches for spell-casting
Recursion is also key, so having ways to get our board back is a no-brainer and we definitely dont want to be feeding the Zombies
In fact, if the creature is small enough, it may even be an improvement to trade it for a forest
(When a creature with undying dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.) Legendary Creature - Cleric Zombie Screaming Swarm Flying Whenever you attack with one or more creatures, target player mills that many cards