Hardened Tactician, The Watcher in the Water, and Mana Echoes

Prerequisites

• Hardened Tactician on the battlefield
• The Watcher in the Water on the battlefield
• Mana Echoes on the battlefield
• undefined available

Steps

1. Activate Hardened Tactician by paying and sacrificing a token
2. If you sacrificed a Tentacle, The Watcher's second ability triggers if the creature token was a Tentacle, untapping a Kraken and putting a stun counter on up to one nonland permanent
3. Resolve the Hardened Tactician ability, causing you to draw a card
4. The Watcher's first ability triggers, creating a 1/1 Tentacle creature token
5. When the Tentacle enters the battlefield, Mana Echoes triggers, adding for each Tentacle you control
6. Repeat

Results

• Infinite card draw
• Near-infinite ETB
• Infinite draw triggers
• Near-infinite LTB
• Near-infinite death triggers
• Near-infinite sacrifice triggers
• Near-infinite colorless mana
• Near-infinite untap of Krakens you control