Hatchery Sliver, Crimson Kobolds, and Arcane Adaptation

Prerequisites

• Hatchery Sliver on the battlefield
• Crimson Kobolds on the battlefield
• Arcane Adaptation on the battlefield
• Arcane Adaptation on the battlefield with "Sliver" chosen

Steps

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