Requires

Bladewing the Risen must be in the command zone. Hellkite Courser must be in hand. Phyrexian Altar must be on the battlefield. Bladewing the Risen must be your commander. Mana needed:

Steps

1. Cast Hellkite Courser by paying .
2. When Hellkite Courser enters the battlefield, it triggers.
3. Holding priority, activate Phyrexian Altar by sacrificing Hellkite Courser, adding one mana of any color.
4. Resolve the Hellkite Courser trigger, putting Bladewing the Risen from the command zone onto the battlefield.
5. When Bladewing the Risen enters the battlefield, it triggers.
6. Holding priority, activate Phyrexian Altar by sacrificing Bladewing the Risen, adding one mana of any color.
7. Choose to return Bladewing the Risen to the command zone from your graveyard.
8. Resolve the Bladewing the Risen trigger from step 5, returning Hellkite Courser from your graveyard to the battlefield.
9. Repeat from step 2.
10. Once you have infinite mana, you may use it to activate Bladewing the Risen's ability.

Results