How can you create a combo with Goldberry, River-Daughter, Thornbite Staff, Phyrexian Altar, Teysa Karlov, Stormbound Geist?
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[START OF COMBO]This combo can be formed with Goldberry, River-Daughter, Thornbite Staff, Phyrexian Altar, Teysa Karlov, Stormbound Geist

Color identity: WUB
Mana cost: 
Steps:
  1. Activate Phyrexian Altar by sacrificing Stormbound Geist, adding {U}.
  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 {U} and tapping it, moving the +1/+1 counter from Goldberry onto Teysa, and causing you to draw a card.
  8. 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 sacrifice triggers[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 Stormbound Geist do not have a +1/+1 counter on it.
[END OF COMBO PREREQUISITES]
assistant