Rex, Cyber-Hound + Trench Behemoth + Walking Atlas

WU identity

Commander legal

The 3 combo pieces

What must be in place

You have at least one land card in hand.
Rex does not have summoning sickness.
Trench Behemoth and Walking Atlas exiled with brain counters on them.

How to execute it

  1. Activate Rex using Walking Atlas's ability by tapping it, putting a land from your hand onto the battlefield.
  2. If the land is mana-producing and enters the battlefield untapped, you may activate it by tapping it, adding at least {1}.
  3. Activate Rex using Trench Behemoth's ability by returning the land from the battlefield to your hand, untapping Rex.
  4. Repeat.

What the combo produces