Boonweaver Giant + Altar of Dementia + Changing Loyalty

Boonweaver Giant

Altar of Dementia

Changing Loyalty

How it works

1. Activate Altar of Dementia by sacrificing Boonweaver Giant
2. When Boonweaver Giant dies, Changing Loyalty triggers, returning Boonweaver Giant from your graveyard to the battlefield
3. When Boonweaver Giant enters, it triggers, returning Changing Loyalty from your graveyard to the battlefield attached to Boonweaver Giant.
4. Resolve the Altar of Dementia ability from step 1.
5. Repeat.