Blossoming Tortoise, Dryad Arbor, Infinite Reflection, and Ashnod's Altar

Prerequisites

• Blossoming Tortoise on the battlefield
• Dryad Arbor in hand
• Infinite Reflection on the battlefield
• Ashnod's Altar on the battlefield
• Infinite Reflection attached to Blossoming Tortoise

Steps

1. Play Dryad Arbor
2. When Dryad Arbor enters the battlefield as a copy of Blossoming Tortoise due to Infinite Reflection, it triggers
3. Holding priority, activate Ashnod's Altar by sacrificing Dryad Arbor, adding
4. Resolve the Dryad Arbor trigger from step 2, causing you to mill three cards and return Dryad Arbor from your graveyard to the battlefield
5. Repeat from step 2

Results

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