Yarus, Roar of the Old Gods, Obscuring Aether, Deathmist Raptor, and Phyrexian Altar

Prerequisites

• Yarus, Roar of the Old Gods on the battlefield
• Obscuring Aether on the battlefield
• Deathmist Raptor in the graveyard
• Phyrexian Altar on the battlefield
• available

Steps

1. Activate Obscuring Aether by paying , turning it face-down as a 2/2 creature
2. Activate Phyrexian Altar by sacrificing Obscuring Aether, adding
3. When Obscuring Aether dies, Yarus's second ability triggers, returning it from your graveyard to the battlefield face down, then turning it face up
4. Deathmist Raptor triggers, returning it from your graveyard to the battlefield face down
5. Activate Phyrexian Altar by sacrificing Deathmist Raptor, adding one mana of any color
6. When Deathmist Raptor dies, Yarus's second ability triggers, returning it from your graveyard to the battlefield face down, then turning it face up
7. Activate Phyrexian Altar by sacrificing Deathmist Raptor, adding one mana of any color
8. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite colored mana
• Infinite sacrifice triggers
• Infinite death triggers