Necrotic Ooze + Boa Constrictor + Cinderhaze Wretch

Necrotic Ooze

Boa Constrictor

Cinderhaze Wretch

How it works

1. Activate Necrotic Ooze using Boa Constrictor's ability by tapping it, giving it +3/+3 until end of turn.
2. Activate Necrotic Ooze using Cinderhaze Wretch's second ability by putting a -1/-1 counter on it, untapping it.
3. Repeat.

With Necrotic Ooze on the battlefield acting as our master vessel, it absorbs the raw potential of both creatures waiting in the graveyard. By leaning on Boa Constrictor's tapped pump ability, the Ooze grows endlessly large as you cycle through the loop. Meanwhile, Cinderhaze Wretch provides the crucial safety valve: its self-counters-for-untap ability lets the Ooze untap itself repeatedly, bypassing summoning sickness and tap restrictions to fuel the pump infinitely.