Boonweaver Giant + Altar of Dementia + Fungal Fortitude

Boonweaver Giant

Altar of Dementia

Fungal Fortitude

How it works

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