Sigil Captain, Rosie Cotton of South Lane, Crystalline Crawler, Ooze Flux, and Doubling Season

Prerequisites

• Sigil Captain on the battlefield
• Rosie Cotton of South Lane on the battlefield
• Crystalline Crawler on the battlefield
• Ooze Flux on the battlefield
• Doubling Season on the battlefield
• You have at least one +1/+1 counter on a creature you control
• available

Steps

1. Activate Ooze Flux by paying and removing a +1/+1 counter from a creature you control, creating two 1/1 Ooze creature tokens
2. Rosie Cotton of South Lane triggers twice, putting two +1/+1 counters on Crystalline Crawler and any other creature you control due to Doubling Season
3. When the Oozes enters the battlefield, Sigil Captain triggers twice, putting four +1/+1 counters on each of them due to Doubling Season
4. Activate Crystalline Crawler's first ability twice by removing two +1/+1 counters from it, adding
5. Repeat

Results

• Infinite +1/+1 counters
• Infinite colored mana
• Infinite creature tokens
• Infinite ETB