Mephidross Vampire + Triskelion
All permanents on the battlefield. Triskelion has at least one +1/+1 counter on it.
- Activate Triskelion by removing a +1/+1 counter from it, dealing 1 damage to any creature an opponent controls
- Triskelion triggers, putting a +1/+1 counter on itself
- Repeat as desired
- You may also repeat this loop whenever a creature enters the battlefield under an opponent's control
Infinite damage to creatures. Destroy any number of creatures opponents control. Destroy all creatures that enter the battlefield under an opponent's control