Felidar Guardian + Vesperlark + Ashnod's Altar

Prerequisites

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Steps

1. 1Cast Felidar Guardian by paying .
2. 2When Felidar Guardian enters the battlefield, it triggers, targeting Vesperlark.
3. 3Holding priority, activate Ashnod's Altar by sacrificing Felidar Guardian.
4. 4Resolve the Felidar Guardian trigger, blinking Vesperlark.
5. 5When Vesperlark leaves the battlefield, it triggers, returning Felidar Guardian from your graveyard to the battlefield.
6. 6Repeat from step 2.

Effects

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