Mephidross Vampire + Walking Ballista

Prerequisites

• Walking Ballista has at least two +1/+1 counters on it.

Steps

1. 1Activate Walking Ballista's second ability by removing a +1/+1 counter from it, dealing 1 damage to any creature an opponent controls.
2. 2Walking Ballista triggers, putting a +1/+1 counter on itself.
3. 3Repeat as desired.
4. 4You may also repeat this loop whenever a creature enters the battlefield under an opponent's control.

Effects

• Destroy any number of creatures opponents control
• Destroy each creature that enters the battlefield under an opponent's control
• Infinite damage to creatures
• Lock