Goldberry, River-Daughter, Phyrexian Altar, Stormbound Geist, Teysa Karlov, and Thornbite Staff

Prerequisites

• Goldberry, River-Daughter on the battlefield
• Phyrexian Altar on the battlefield
• Stormbound Geist on the battlefield
• Teysa Karlov on the battlefield
• Thornbite Staff 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 twice
3. Resolve both Stormbound Geist triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
4. Resolve the first Goldberry trigger, untapping it
5. Holding priority, activate Goldberry's first ability by tapping it, moving the +1/+1 counter from Stormbound Geist onto Goldberry
6. Resolve the second 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 Teysa, 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