Necrotic Ooze + Wizard Class + Devoted Druid + Niv-Mizzet, the Firemind

Necrotic Ooze

Wizard Class

Devoted Druid

Niv-Mizzet, the Firemind

How it works

1. Activate Necrotic Ooze using Niv-Mizzet's ability by tapping it, causing you to draw a card.
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 loop turns Necrotic Ooze into a one-machine engine by letting it borrow activated abilities from the graveyard, fueled by Devoted Druid's self-untapping power to continuously generate mana and untap opportunities. With Wizard Class leveled up to three, every single card draw pumps a +1/+1 counter onto the Ooze to instantly neutralize the -1/-1 counters that Devoted Druid leaves behind. At the same time, this churning card draw unleashes Niv-Mizzet, the Firemind's fiery wrath, pinging down any target for lethal damage as you cycle through your deck.