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

The Watcher in the Water

Wylie Duke, Atiin Hero

Heart of Kiran

Conspiracy

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 transforms a simple crew cost into a self-sustaining engine by rewriting the very nature of your army with Conspiracy, which ensures every creature you control counts as a Tentacle. Wylie Duke, Atiin Hero handles the heavy lifting by tapping to crew Heart of Kiran, which in turn triggers Wylie Duke to draw a card and gain you life. That card draw on an opponent's turn immediately satisfies The Watcher in the Water, spitting out a Tentacle token that you can promptly feed to Phantom Train. When that Tentacle hits the graveyard, The Watcher in the Water triggers its second ability to untap Wylie Duke, readying the hero to crew the vehicle all over again while Phantom Train grows stronger with a fresh +1/+1 counter.