Kentaro, the Smiling Cat + Shrieking Drake + Urza's Incubator + Rukarumel, Biologist

Kentaro, the Smiling Cat

Shrieking Drake

Urza's Incubator

Rukarumel, Biologist

How it works

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

This clever loop transforms Shrieking Drake into a zero-mana self-bouncing engine by combining Rukarumel, Biologist—with its type-granting aura set to Samurai—and Urza's Incubator, which reduces that type's cost by {2}. Kentaro, the Smiling Cat completes the cost-reduction puzzle by allowing you to pay {X} rather than a Samurai's mana cost, turning the Drake's mana value of {1}{U} into a zero-cost spell. Because the Drake must bounce a creature upon entering, it simply targets itself, creating an endless cycle of entering and leaving the battlefield that generates infinite storm count and ETB triggers.