Necrotic Ooze + Wizard Class + Devoted Druid + Merfolk Looter

Necrotic Ooze

Wizard Class

Devoted Druid

Merfolk Looter

How it works

1. Activate Necrotic Ooze using Merfolk Looter's ability by tapping it, causing you to loot.
2. Wizard Class triggers, putting a +1/+1 counter on Necrotic Ooze.
3. Activate Necrotic Ooze using Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it.
4. Repeat.

This clever graveyard loop transforms Necrotic Ooze into a one-man engine by harvesting the activated abilities of fallen creatures. With Wizard Class leveled up to three, every card drawn passively pumps your creatures with +1/+1 counters, which conveniently cancels out the -1/-1 counters you place on Necrotic Ooze to continuously untap it using Devoted Druid's ability. Meanwhile, you tap the Ooze to use Merfolk Looter's ability, churning through your entire deck to find whatever win condition you desire.