Hatchery Sliver, Ornithopter, and Leyline of Transformation

Prerequisites

• Hatchery Sliver on the battlefield
• Ornithopter on the battlefield
• Leyline of Transformation on the battlefield

Steps

1. Cast Ornithopter by paying , and choosing to pay its replicate cost an arbitrarily large number of times by paying
2. Ornithopter triggers, creating a copy of it for each time its replicate cost was paid
3. Resolve all Ornithopter spells, causing the nontoken Ornithopter to enter the battlefield, and creating a token copy of it for each time its replicate cost was paid

Results

• Infinite ETB
• Infinite creature tokens