All 8 Combos with Goldberry, River-Daughter

Goldberry, River-Daughter + Thornbite Staff + Phyrexian Altar + Mind Over Matter + Geralf's Mindcrusher

Other: Infinite draw triggers, Infinite rummaging, Infinite self-discard triggers, Near-infinite +1/+1 counters, Near-infinite death triggers, Near-infinite ETB, Near-infinite LTB, Near-infinite mill, Near-infinite sacrifice triggers

Activate Phyrexian Altar by sacrificing Geralf's Mindcrusher, adding {U}. When Geralf's Mindcrusher dies, its undying ability and Goldberry trigger. Resolve the Geralf's Mindcrusher trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it. When Geralf's Mindcrusher enters the battlefield, it triggers, causing a player to mill five cards. Holding priority, activate Mind over Matter by discarding a card, untapping Goldberry. Activate Goldberry's first ability by tapping it, moving the +1/+1 counter from Geralf's Mindcrusher onto Goldberry. Resolve the Goldberry trigger from step 2, untapping it. Activate Goldberry's second ability by paying {U} and tapping it, moving the +1/+1 counter from Goldberry onto any permanent except Geralf's Mindcrusher, and causing you to draw a card. Repeat.