Kentaro, the Smiling Cat + Kor Skyfisher + Urza's Incubator + Maskwood Nexus

Kentaro, the Smiling Cat

Kor Skyfisher

Urza's Incubator

Maskwood Nexus

How it works

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

This clever loop relies on Maskwood Nexus to turn every creature in your deck and hand into a Samurai, which allows Kentaro, the Smiling Cat to let you cast them for a mana value of zero by paying {X} where X is zero. With that cost reduction in place, Urza's Incubator steps in to reduce the cost of your Samurai spells even further, ensuring Kor Skyfisher can be cast for free over and over again. Every time Kor Skyfisher enters the battlefield, its own mandatory trigger forces it right back to your hand, fueling an endless cycle of enters-the-battlefield and leaves-the-battlefield triggers alongside an ever-growing storm count.