Goldberry, River-Daughter, Thornbite Staff, Phyrexian Altar, Drivnod, Carnage Dominus, and Geralf's Mindcrusher

Prerequisites

• Goldberry, River-Daughter on the battlefield
• Thornbite Staff on the battlefield
• Phyrexian Altar on the battlefield
• Drivnod, Carnage Dominus on the battlefield
• Geralf's Mindcrusher on the battlefield
• Thornbite Staff attached to Goldberry
• Goldberry does not have summoning sickness
• Goldberry and Geralf's Mindcrusher do not have a +1/+1 counter on it

Steps

1. Activate Phyrexian Altar by sacrificing Geralf's Mindcrusher, adding
2. When Geralf's Mindcrusher dies, its undying ability and Goldberry trigger twice
3. Resolve the first Geralf's Mindcrusher trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it
4. When Geralf's Mindcrusher enters the battlefield, it triggers, causing a player to mill five cards
5. Resolve the second Geralf's Mindcrusher trigger, doing nothing
6. Resolve the first Goldberry trigger, untapping it
7. Holding priority, activate Goldberry's first ability by tapping it, moving the +1/+1 counter from Geralf's Mindcrusher onto Goldberry
8. Resolve the second Goldberry trigger from step 2, untapping it
9. Activate Goldberry's second ability by paying and tapping it, moving the +1/+1 counter from Goldberry onto Drivnod, and causing you to draw a card
10. 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 mill
• Near-infinite sacrifice triggers