Heidar, Rimewind Master + Intruder Alarm + Dual Nature + Ashnod's Altar + Crookshank Kobolds

Heidar, Rimewind Master

Intruder Alarm

Dual Nature

Ashnod's Altar

Crookshank Kobolds

How it works

1. Cast Crookshank Kobolds by paying 0.
2. When Crookshank Kobolds enters the battlefield, Intruder Alarm and Dual Nature's first ability triggers.
3. Resolve the Intruder Alarm trigger, untapping all creatures.
4. Resolve the Dual Nature trigger, creating a token copy of Crookshank Kobolds.
5. Activate Ashnod's Altar by sacrificing the Crookshank Kobolds token, adding CC.
6. Activate Heidar by paying 2 and tapping it, returning Crookshank Kobolds to your hand from the battlefield.
7. Dual Nature's second ability triggers, exiling nothing.
8. Repeat.

This intricate loop begins by deploying Crookshank Kobolds for free, which instantly triggers both Intruder Alarm to untap your creatures and Dual Nature to spawn a token copy of the kobolds. You can then feed that token to Ashnod's Altar for a pair of colorless mana, which readily fuels Heidar, Rimewind Master's activation cost to bounce the original kobolds back to your hand (assuming you control the necessary snow permanents). With the original kobolds safely returned, Intruder Alarm's global untap ensures Heidar, Rimewind Master is ready to repeat the process, generating infinite mana, storm count, and entry/leave-the-battlefield triggers.