Hylda of the Icy Crown + Intruder Alarm + Ashnod's Altar + Court Street Denizen

Hylda of the Icy Crown

Intruder Alarm

Ashnod's Altar

Court Street Denizen

How it works

1. Cause a white creature to enter the battlefield under your control.
2. Intruder Alarm and Court Street Denizen trigger.
3. Resolve the Intruder Alarm trigger, untapping all creatures.
4. Holding priority, activate Ashnod's Altar by sacrificing the white creature, adding CC.
5. Resolve the Court Street Denizen trigger, tapping an opponent's creature.
6. Hylda of the Icy Crown triggers, causing you to pay 1 to create a 4/4 Elemental creature token.
7. Repeat from step 2.
8. Once you have infinite mana, you may forego sacrificing the Elemental tokens.

This clever loop transforms a simple white creature entering the battlefield into an overwhelming engine of creation and wealth. As Court Street Denizen triggers to tap an opponent's creature upon a white creature's arrival, Hylda of the Icy Crown leaps into action to let you pay a single mana for massive value, perfectly fueled by sacrificing that creature to Ashnod's Altar for colorless mana. Meanwhile, Intruder Alarm acts as the mechanical heartbeat of the operation, ensuring that every single creature entry untaps your board so you can repeat the cycle endlessly.