Life and Limb + Arcane Adaptation + Scute Swarm

Life and Limb

Arcane Adaptation

Scute Swarm

How it works

1. Play any land.
2. When the land enters the battlefield, each Scute Swarm you control triggers.
3. Resolve the first trigger, creating either a 1/1 Insect creature token or a token copy of Scute Swarm.
4. When the creature token enters the battlefield as a 1/1 Saproling that is also a Forest land due to Life and Limb and Arcane Adaptation, each Scute Swarm you control triggers.
5. Repeat from step 3.
6. NOTE: This combo creates an infinite mandatory loop that will draw the game if it is not interacted with.

This loop turns a simple land drop into an unstoppable avalanche of multiplying life. With Arcane Adaptation naming "Saproling" and Life and Limb turning every Forest into a Saproling and vice versa, any creature token that enters immediately counts as a land, which in turn triggers Scute Swarm. Once you control six or more lands, every single Scute Swarm triggers off these land-creatures entering to copy itself, creating an infinite mandatory loop of new Scute Swarms that also double as new lands, forcing a draw if not interrupted.