Adarkar Valkyrie + Thornbite Staff + Phyrexian Altar

Prerequisites

• Adarkar Valkyrie does not have summoning sickness. You control at least one additional nontoken creature.
• Thornbite Staff attached to Adarkar Valkyrie.

Steps

1. 1Activate Adarkar Valkyrie by tapping it, targeting another creature you control.
2. 2Activate Phyrexian Altar by sacrificing the creature targeted in step 1, adding one mana of any color.
3. 3When the creature dies, Adarkar Valkyrie triggers twice.
4. 4Resolve the first trigger, untapping Adarkar Valkyrie.
5. 5Resolve the second trigger, returning the sacrificed creature from your graveyard to the battlefield.
6. 6Repeat.

Effects

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