The Watcher in the Water + Wylie Duke, Atiin Hero + Heart of Kiran + Maskwood Nexus + Yahenni, Undying Partisan

The Watcher in the Water

Wylie Duke, Atiin Hero

Heart of Kiran

Maskwood Nexus

Yahenni, Undying Partisan

How it works

1. During an opponent's turn, activate Heart of Kiran by tapping Wylie Duke.
2. Wylie Duke triggers, causing you to draw a card and gain 1 life.
3. The Watcher's first ability triggers, creating a 1/1 Tentacle creature token.
4. Resolve the Heart of Kiran ability, causing it to become a creature until end of turn.
5. Activate Yahenni by sacrificing the Tentacle.
6. When the Tentacle dies, The Watcher's second ability triggers, untapping Wylie Duke and putting a stun counter on up to one permanent.
7. Resolve the Yahenni ability
8. Repeat.

This intricate loop turns an opponent's turn into your own personal engine of perpetual motion by binding creature types together with Maskwood Nexus, which ensures every creature you control counts as a Tentacle and a Kraken to satisfy The Watcher in the Water's triggers. You initiate the sequence by tapping Wylie Duke, Atiin Hero to pay the crew cost for Heart of Kiran, which in turn fires off Wylie Duke's ability to draw a card and gain life. That drawn card triggers The Watcher in the Water to spawn a Tentacle, which you immediately feed to Yahenni, Undying Partisan as a sacrifice. The death of that Tentacle lets The Watcher untap Wylie Duke, readying the whole cycle to repeat endlessly while Yahenni safely avoids destruction along the way.