Sigil Captain + Rosie Cotton of South Lane + Crystalline Crawler + 2 more
Infinite creature tokens, Infinite ETB, Infinitely large creature
Activate Ooze Flux by paying and removing a +1/+1 counter from a creature you control, creating a 1/1 Ooze creature token.
Rosie Cotton of South Lane triggers, putting two +1/+1 counters on Crystalline Crawler due to Pir.
When the Ooze enters the battlefield, Sigil Captain triggers, putting four +1/+1 counters on it due to Pir.
Activate Crystalline Crawler's first ability twice by removing two +1/+1 counters from it, adding .
Repeat.
Once you have infinite Oozes with a +1/+1 counter
Component Cards
How It Works
Activate Ooze Flux by paying and removing a +1/+1 counter from a creature you control, creating a 1/1 Ooze creature token.
Rosie Cotton of South Lane triggers, putting two +1/+1 counters on Crystalline Crawler due to Pir.
When the Ooze enters the battlefield, Sigil Captain triggers, putting four +1/+1 counters on it due to Pir.
Activate Crystalline Crawler's first ability twice by removing two +1/+1 counters from it, adding .
Repeat.
Once you have infinite Oozes with a +1/+1 counter on them, you may remove those counters to create an infinitely large Ooze using Ooze Flux.