Vesperlark + Glasspool Mimic // Glasspool Shore + Altar of Dementia

Vesperlark

Glasspool Mimic // Glasspool Shore

Altar of Dementia

How it works

1. Activate Altar of Dementia by sacrificing Glasspool Mimic.
2. When Glasspool Mimic dies, it triggers, returning itself from your graveyard to the battlefield as a copy of Vesperlark.
3. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Glasspool Mimic's power.
4. Repeat.

This clever loop relies on Glasspool Mimic entering the battlefield as a copy of Vesperlark, locking in a low-power body that easily meets Vesperlark's restriction for its leaves-the-battlefield recursion ability. By sacrificing that Vesperlark-copy to Altar of Dementia, you trigger its return effect to bring it right back to the battlefield—where it once again chooses to enter as a copy of Vesperlark, restarting the cycle. Because Altar of Dementia mills your opponent based on the sacrificed creature's power, this continuous loop grinds through their entire library while generating an endless stream of death and entry triggers.