Activate Goblin Bombardment by sacrificing Mistmoon Griffin.
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 Goblin Bombardment by sacrificing the Mistmoon Griffin token.
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.
Resolve the Goblin Bombardment abilities from steps 1 and 5, dealing 2 damage to any target(s).
Repeat.

Infinite damage

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Hofri Ghostforge

Mistmoon Griffin

Goblin Bombardment

Activate Saffi by sacrificing it, targeting Mistmoon Griffin.
Activate Goblin Bombardment by sacrificing Mistmoon Griffin.
When Mistmoon Griffin dies, it and Saffi trigger.
Resolve the Saffi trigger, returning Mistmoon Griffin from your graveyard to the battlefield.
Resolve the Mistmoon Griffin trigger, failing to exile it as it is not in your graveyard and then returning Saffi from your graveyard to the battlefield.
Resolve the Goblin Bombardment ability.
Repeat.

Saffi Eriksdotter

Activate Ashnod's Altar by sacrificing Mistmoon Griffin, adding {C}{C}.
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 Ashnod's Altar by sacrificing the Mistmoon Griffin token, adding {C}{C}.
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.

Infinite colorless mana

Ashnod's Altar

Activate Altar of Dementia by sacrificing Mistmoon Griffin.
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.
Resolve the Altar of Dementia ability from step 1, causing target player to mill cards equal to Mistmoon Griffin's power.
Activate Altar of Dementia by sacrificing the Mistmoon Griffin token.
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.
Resolve the Altar of Dementia ability from step 6, causing target player to mill cards equal to Mistmoon Griffin's power.
Repeat.

Infinite mill

Infinite self-mill

Altar of Dementia

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.

Combos with "Mistmoon Griffin"