How can you create a combo with Goldberry, River-Daughter, Thornbite Staff, Phyrexian Altar, Intruder Alarm, Geralf's Mindcrusher?
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[START OF COMBO]This combo can be formed with Goldberry, River-Daughter, Thornbite Staff, Phyrexian Altar, Intruder Alarm, Geralf's Mindcrusher

Color identity: U
Mana cost: 
Steps:
  1. Activate Phyrexian Altar by sacrificing Geralf's Mindcrusher, adding {U}.
  2. When Geralf's Mindcrusher dies, its undying ability and Goldberry trigger.
  3. Resolve the 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 and Intruder Alarm triggers.
  5. Resolve the Geralf's Mindcrusher trigger, causing a player to mill five cards.
  6. Resolve the Intruder Alarm trigger, untapping all creatures.
  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 Goldberry trigger from step 2, untapping it.
  9. 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.
  10. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite card draw
  - Infinite draw triggers
  - Near-infinite +1/+1 counters
  - Near-infinite death triggers
  - Near-infinite enters the battlefield
  - Near-infinite leaves the battlefield
  - Near-infinite mill
  - Near-infinite sacrifice triggers
  - Near-infinite untap of all creatures[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be 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.
[END OF COMBO PREREQUISITES]
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