Shalai and Hallar, and Trelasarra, Moon Dancer

Prerequisites

• Shalai and Hallar on the battlefield
• Trelasarra, Moon Dancer on the battlefield
• You have a way to give Shalai and Hallar lifelink
• You have a way to put a +1/+1 counter on a creature you control

Steps

1. Put a +1/+1 counter on a creature you control
2. Shalai and Hallar triggers, dealing 1 damage to an opponent and causing you to gain one life
3. Trelasarra triggers, putting a +1/+1 counter on itself and causing you to scry 1
4. Repeat from step 2

Results

• Infinite +1/+1 counters on Trelasarra
• Infinite damage
• Infinite lifegain
• Infinite lifegain triggers
• Infinite scry 1