Hatchery Sliver + Maskwood Nexus + Phyrexian Walker

Hatchery Sliver

Maskwood Nexus

Phyrexian Walker

How it works

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