Hatchery Sliver + Leyline of Transformation + Phyrexian Walker

GU identity

Commander legal

The 3 combo pieces

How to execute it

  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.

What the combo produces