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

The Watcher in the Water

Wylie Duke, Atiin Hero

Heart of Kiran

Leyline of Transformation

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 starts by using Wylie Duke, Atiin Hero to crew Heart of Kiran, tapping Wylie Duke to trigger its life gain and card draw. Thanks to Leyline of Transformation, every creature you control is a Kraken, allowing The Watcher in the Water to recognize your opponents'-turn card draw and spawn a 1/1 Tentacle. You then feed that newly created Tentacle to Phantom Train, which gives the Train a +1/+1 counter and triggers The Watcher in the Water's second ability when the Tentacle dies. That death trigger untaps Wylie Duke, readying it to crew Heart of Kiran once again and keeping the infinite cycle spinning.