Requires

Invasion of Tolvada // The Broken Sky must be in hand. Felidar Guardian must be in the graveyard. Altar of Dementia must be on the battlefield. Mana needed:

Steps

1. Cast Invasion of Tolvada by paying .
2. When Invasion of Tolvada enters the battlefield, it triggers, returning Felidar Guardian from your graveyard to the battlefield.
3. When Felidar Guardian enters the battlefield, it triggers, targeting Invasion of Tolvada.
4. Holding priority, activate Altar of Dementia by sacrificing Felidar Guardian, causing target player to mill cards equal to Felidar Guardian's power.
5. Resolve the Felidar Guardian trigger, blinking Invasion of Tolvada.
6. Repeat from step 2.

Results