Hatchery Sliver + Maskwood Nexus + Crookshank Kobolds

Hatchery Sliver

Maskwood Nexus

Crookshank Kobolds

How it works

1. Cast Crookshank Kobolds by paying 0, and choosing to pay its replicate cost an arbitrarily large number of times by paying 0.
2. Crookshank Kobolds triggers, creating a copy of it for each time its replicate cost was paid.
3. Resolve all Crookshank Kobolds spells, causing the nontoken Crookshank Kobolds to enter the battlefield, and creating a token copy of it for each time its replicate cost was paid.