Hofri Ghostforge | Mistmoon Griffin | Phyrexian Altar

Cards

Activate
Phyrexian Altar by sacrificing
Mistmoon Griffin, adding one mana of any color.
Mistmoon Griffin dies, triggering itself and
Hofri Ghostforge.
Resolve the
Hofri Ghostforge trigger, exiling
Mistmoon Griffin from your graveyard and creating a token copy of
Mistmoon Griffin that has "When this creature leaves the battlefield, return the exiled card to your graveyard".
Resolve the
Mistmoon Griffin trigger, returning nothing from your graveyard to the battlefield.
Activate
Phyrexian Altar by sacrificing the
Mistmoon Griffin token, adding one mana of any color.
The
Mistmoon Griffin token dies, triggering itself twice.
Resolve the
Mistmoon Griffin token's trigger granted by
Hofri Ghostforge, returning
Mistmoon Griffin from exile to your graveyard.
Resolve the other
Mistmoon Griffin trigger, returning
Mistmoon Griffin from your graveyard to the battlefield.
Repeat.