The Watcher in the Water, Wylie Duke, Atiin Hero, Heart of Kiran, Blasting Station, and Rukarumel, Biologist

Prerequisites

• The Watcher in the Water on the battlefield
• Wylie Duke, Atiin Hero on the battlefield
• Heart of Kiran on the battlefield
• Blasting Station on the battlefield
• Rukarumel, Biologist on the battlefield
• Wylie Duke does not have summoning sickness
• It is an opponent's turn

Steps

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. When the Tentacle enters the battlefield, Blasting Station triggers, untapping Blasting Station
5. Resolve the Heart of Kiran ability, causing it to become a creature until end of turn
6. Activate Blasting Station by tapping it and sacrificing the Tentacle
7. When the Tentacle dies, The Watcher's second ability triggers, untapping Wylie Duke and putting a stun counter on up to one permanent
8. Resolve the Blasting Station ability, dealing 1 damage to any target
9. Repeat

Results

• Near-infinite damage
• Infinite card draw
• Near-infinite lifegain
• Near-infinite lifegain triggers
• Near-infinite ETB
• Near-infinite LTB
• Near-infinite death triggers
• Near-infinite sacrifice triggers
• Infinite draw triggers