Swift Warkite, Protean Raider, and Ashnod's Altar

Prerequisites

• Swift Warkite on the battlefield
• Protean Raider in hand
• Ashnod's Altar on the battlefield
• You attacked with a creature this turn
• available

Steps

1. Cast Protean Raider by paying , choosing to have it enter the battlefield as a copy of Swift Warkite
2. When Protean Raider enters the battlefield, it triggers
3. Holding priority, activate Ashnod's Altar by sacrificing Protean Raider, adding
4. Resolve the Protean Raider trigger, returning Protean Raider from your graveyard to the battlefield as a copy of Swift Warkite
5. Repeat from step 2

Results

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