Scarecrone, Thornbite Staff, Myr Battlesphere, and Ashnod's Altar

Prerequisites

• Scarecrone on the battlefield
• Thornbite Staff on the battlefield
• Myr Battlesphere on the battlefield
• Ashnod's Altar on the battlefield
• Thornbite Staff attached to Scarecrone
• Scarecrone does not have summoning sickness
• available

Steps

1. Activate Ashnod's Altar by sacrificing Myr Battlesphere, adding
2. Myr Battlesphere dies, triggering Scarecrone, untapping Scarecrone
3. Activate Scarecrone's second ability by paying and tapping it, returning Myr Battlesphere from your graveyard to the battlefield
4. Myr Battlesphere enters the battlefield, creating four 1/1 Myr creature tokens
5. Activate Ashnod's Altar by sacrificing a Myr token, adding
6. Repeat

Results

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