Sliver Queen, Cathars' Crusade, and Cryptic Trilobite

Prerequisites

• Sliver Queen on the battlefield
• Cathars' Crusade on the battlefield
• Cryptic Trilobite on the battlefield
• Cryptic Trilobite has at least two +1/+1 counters on it

Steps

1. Activate Cryptic Trilobite's first ability by removing a +1/+1 counter from it, adding that can only be spent to activate abilities
2. Activate Sliver Queen by paying , creating a 1/1 Sliver creature token
3. The Sliver enters the battlefield, triggering Cathars' Crusade, putting a +1/+1 counter on each creature you control
4. Repeat

Results

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