Rex, Cyber-Hound + Trench Behemoth + Walking Atlas

Prerequisites

• 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.

Steps

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

Effects

• Infinite landfall triggers
• Infinite mana lands you control that enter the battlefield untapped can produce