Cathars' Crusade, Devoted Druid, and Flourishing Defenses

Prerequisites

• Cathars' Crusade on the battlefield
• Devoted Druid on the battlefield
• Flourishing Defenses on the battlefield

Steps

1. Activate Devoted Druid by tapping it, adding
2. Activate Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it
3. Flourishing Defenses triggers, creating a creature token
4. When the creature token enters, Cathars' Crusade triggers, putting a +1/+1 counter on each creature you control
5. Repeat

Results

• Infinite ETB
• Infinite creature tokens
• Infinite green mana
• Infinite +1/+1 counters on creatures you control