Lurking Roper + Splinter Twin + Soul Warden

Lurking Roper

Splinter Twin

Soul Warden

How it works

1. Activate Lurking Roper by tapping it, creating a token copy of itself.
2. When the Lurking Roper token enters the battlefield, Soul Warden triggers, causing you to gain 1 life.
3. Each Lurking Roper you control triggers, untapping themselves.
4. Repeat.

By enchanting Lurking Roper with Splinter Twin, you grant the creature the ability to spawn a duplicate of itself with haste, which immediately enters the battlefield to trigger Soul Warden's lifegain ability. That single point of life causes every Lurking Roper—both the original and any token copies—to untap due to their own static triggered abilities, leaving your entire army fresh and ready to tap for another copy. Because each newly minted token doubles your untap capacity, this loop quickly spirals out of hand to generate infinite creature tokens with haste, infinite creature ETB events, and infinite lifegain.