How can you create a combo with Urza, Prince of Kroog, Su-Chi Cave Guard, Altar of Dementia?
user
[START OF COMBO]This combo can be formed with Urza, Prince of Kroog, Su-Chi Cave Guard, Altar of Dementia

Color identity: WU
Mana cost: {6}
Steps:
  1. Activate Urza by paying {6}, creating a token copy of Su-Chi Cave Guard that is a 1/1 Soldier in addition to its other types.
  2. Activate Altar of Dementia by sacrificing Su-Chi Cave Guard.
  3. Su-Chi Cave Guard dies, adding eight {C}.
  4. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Su-Chi Cave Guard's power.
  5. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colorless mana
  - Infinite creature tokens
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite mill
  - Infinite sacrifice triggers
  - Infinite self-mill[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
[END OF COMBO PREREQUISITES]
assistant