During an opponent's turn, cast Trickery Charm by paying , causing Wylie Duke to become a Kraken until end of turn.
Activate Heart of Kiran by tapping Wylie Duke.
Wylie Duke triggers, causing you to draw a card and gain 1 life.
The Watcher's first ability triggers, creating a 1/1 Tentacle creature token.
Resolve the Heart of Kiran ability, causing it to become a creature until end of turn.
Activate Shilgengar by sacrificing the Tentacle.
When the Tentacle dies, The Watcher's second ability triggers, untapping Wylie Duke and putting a stun counter on up to one permanent.
Resolve the Shilgengar ability
Repeat from step 2.
By temporarily transforming Wylie Duke, Atiin Hero into a Kraken using Trickery Charm, he becomes a legal target to be repeatedly untapped by The Watcher in the Water. Tapping Wylie Duke to crew Heart of Kiran triggers his ability to draw a card and gain life, which in turn causes The Watcher in the Water to generate a 1/1 Tentacle creature token on your opponent's turn. You can then sacrifice that Tentacle to Shilgengar, Sire of Famine to create a Blood token; this death triggers The Watcher in the Water once more to untap Wylie Duke, letting you loop the entire process for near-infinite card draw, life, and Blood tokens.