Necrotic Ooze + Trench Behemoth + Skyshroud Ranger

Necrotic Ooze

Trench Behemoth

Skyshroud Ranger

How it works

1. Activate Necrotic Ooze using Skyshroud Ranger'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 Necrotic Ooze using Trench Behemoth's ability by returning the land from the battlefield to your hand, untapping Necrotic Ooze.
4. Repeat.

This clever loop hinges entirely on Necrotic Ooze absorbing the activated abilities of fallen creatures to orchestrate a perpetual motion machine. By granting itself Skyshroud Ranger's tapping ability, the Ooze can rapidly drop lands from your hand straight onto the battlefield. From there, Trench Behemoth's activated ability steps in to let you bounce that very same land right back to your hand, paying the cost to untap the Ooze and ready it to repeat the cycle. Because the land is constantly re-entering play and returning to hand, you generate an endless cascade of landfall triggers alongside an infinite supply of mana from any lands that enter untapped.