The Watcher in the Water + Skullclamp + Leonin Shikari + Phyrexian Altar

The Watcher in the Water

Skullclamp

Leonin Shikari

Phyrexian Altar

How it works

1. During an opponent's turn, activate Skullclamp's equip ability by paying 1, attaching it to another creature with toughness equal to 1.
2. The creature dies as a state-based action due to having 0 toughness. The Watcher's second ability triggers if the creature was a Tentacle, and Skullclamp triggers.
3. Resolve the Watcher trigger, if applicable, untapping a Kraken and putting a stun counter on a permanent.
4. Resolve the Skullclamp trigger, causing you to draw two card.
5. The Watcher's first ability triggers twice, creating two 1/1 Tentacle creature tokens.
6. Activate Phyrexian Altar by sacrificing a Tentacle, adding 1.
7. Repeat.