Rograkh, Son of Rohgahh + Myth Unbound + Altar of Dementia + Estrid's Invocation

Rograkh, Son of Rohgahh

Myth Unbound

Altar of Dementia

Estrid's Invocation

How it works

1. Activate Altar of Dementia by sacrificing Rograkh.
2. Choose to have Rograkh return to the command zone from your graveyard.
3. Both copies of Myth Unbound trigger, causing you to draw two cards.
4. Resolve the ability from step 1, accomplishing nothing.
5. Cast Rograkh from the command zone by paying 0 due to the cost reductions from both copies of Myth Unbound.
6. Repeat.

This clever loop turns zero-mana commander casts into a churning engine of sacrifice and card draw, legal in Commander and Oathbreaker. Because Rograkh, Son of Rohgahh costs nothing to cast, you can feed him directly to Altar of Dementia to mill your opponents. Sending Rograkh back to the command zone triggers Myth Unbound—and since Myth Unbound’s passive cost reduction compounds each time your commander is cast, and its triggered ability rewards you with card draw every time your commander hits the zone, the stack becomes a wellspring of advantage. To keep the chain unbroken, Estrid's Invocation can enter as a copy of Myth Unbound to double up on both the cost reduction and the card draw triggers, ensuring Rograkh can be recast for free endlessly.