Kentaro, the Smiling Cat + Whitemane Lion + Urza's Incubator + Arcane Adaptation

Kentaro, the Smiling Cat

Whitemane Lion

Urza's Incubator

Arcane Adaptation

How it works

1. Cast Whitemane Lion by paying 0.
2. When Whitemane Lion enters the battlefield, it triggers, returning itself from the battlefield to your hand.
3. Repeat.

This clever loop turns Whitemane Lion into a zero-mana self-bouncing engine by reshaping the battlefield's tribal rules. With Arcane Adaptation naming Samurai and Urza's Incubator discounting that same chosen type by {2}, Kentaro, the Smiling Cat's alternative cost ability allows you to cast the Lion for free. Every time Whitemane Lion enters the battlefield, its own triggered ability forces you to return a creature you control to your hand—naturally choosing the Lion itself so you can immediately recast it and repeat the process.