Rite of Passage, Walking Ballista, and Conclave Mentor

Prerequisites

• Rite of Passage on the battlefield
• Walking Ballista on the battlefield
• Conclave Mentor on the battlefield
• Walking Ballista has at least 3 +1/+1 counters on it

Steps

1. Remove a +1/+1 counter from Walking Ballista to deal 1 damage to Walking Ballista
2. Rite of Passage triggers, putting 2 +1/+1 counters on Walking Ballista
3. Repeat for infinite +1/+1 counters
4. End the turn, removing all damage marked on Walking Ballista
5. Remove infinite counters from Walking Ballista to deal infinite damage

Results

• Infinite +1/+1 counters on Walking Ballista
• Infinite damage