The Watcher in the Water + Wylie Duke, Atiin Hero + Heart of Kiran + Xenograft + Phantom Train

The Watcher in the Water

Wylie Duke, Atiin Hero

Heart of Kiran

Xenograft

Phantom Train

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 Phantom Train 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 Phantom Train ability
8. Repeat.

This intricate loop turns an opponent's turn into an endless engine by using Xenograft to redefine every creature you control as a Kraken, allowing The Watcher in the Water to recognize your Tentacle tokens and untap Wylie Duke in return. By tapping Wylie Duke to bypass the crew cost for Heart of Kiran, you draw a card that triggers The Watcher in the Water to spawn a fresh Tentacle. You then feed that token to Phantom Train, whose sacrifice triggers The Watcher in the Water once more to untap Wylie Duke and keep the entire sequence flowing indefinitely.