Tayam, Luminous Enigma, Devoted Druid, Ashnod's Altar, and Stormbound Geist

Prerequisites

• Tayam, Luminous Enigma on the battlefield
• Devoted Druid on the battlefield
• Ashnod's Altar on the battlefield
• Stormbound Geist on the battlefield
• Devoted Druid does not have summoning sickness
• Stormbound Geist does not have a +1/+1 counter on it
• Devoted Druid does not have a -1/-1 counter on it

Steps

1. Activate Devoted Druid's first ability by tapping it, adding
2. Activate Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it
3. Activate Ashnod's Altar by sacrificing Stormbound Geist, adding
4. When Stormbound Geist dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter and a vigilance counter on it
5. Activate Tayam by paying , removing a -1/-1 counter from Devoted Druid, and both counters from Stormbound Geist
6. Holding priority, repeat steps 3 and 4 one additional time
7. Activate Ashnod's Altar by sacrificing Stormbound Geist, adding
8. Resolve Tayam's ability from step 5, causing you to mill three cards and returning Stormbound Geist from your graveyard to the battlefield
9. Repeat

Results

• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite green mana
• Infinite LTB
• Infinite sacrifice triggers
• Infinite self-mill
• Put all permanents with mana value three or less from your graveyard and library onto the battlefield