Goldberry, River-Daughter, Thornbite Staff, Phyrexian Altar, Intruder Alarm, and Stormbound Geist

Prerequisites

• Goldberry, River-Daughter on the battlefield
• Thornbite Staff on the battlefield
• Phyrexian Altar on the battlefield
• Intruder Alarm on the battlefield
• Stormbound Geist on the battlefield
• Thornbite Staff attached to Goldberry
• Goldberry does not have summoning sickness
• Goldberry and Stormbound Geist do not have a +1/+1 counter on it

Steps

1. Activate Phyrexian Altar by sacrificing Stormbound Geist, adding
2. When Stormbound Geist dies, its undying ability and Goldberry trigger
3. Resolve the Stormbound Geist trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it
4. When Stormbound Geist enters the battlefield, Intruder Alarm triggers, untapping all creatures
5. Holding priority, activate Goldberry's first ability by tapping it, moving the +1/+1 counter from Stormbound Geist onto Goldberry
6. Resolve the Goldberry trigger from step 2, untapping it
7. Activate Goldberry's second ability by paying and tapping it, moving the +1/+1 counter from Goldberry onto any permanent except Stormbound Geist, and causing you to draw a card
8. Repeat

Results

• Infinite card draw
• Infinite draw triggers
• Near-infinite +1/+1 counters
• Near-infinite death triggers
• Near-infinite ETB
• Near-infinite LTB
• Near-infinite sacrifice triggers
• Near-infinite untap of all creatures