How can you create a combo with Urza, Prince of Kroog, Mycosynth Lattice, Training Grounds, Crumbling Vestige?
user
[START OF COMBO]This combo can be formed with Urza, Prince of Kroog, Mycosynth Lattice, Training Grounds, Crumbling Vestige

Color identity: WU
Mana cost: {7}
Steps:
  1. Activate Urza by paying {4}, creating a token copy of Training Grounds that is a 1/1 Soldier in addition to its other types.
  2.  Activate Urza by paying {2}, creating a token copy of Training Grounds that is a 1/1 Soldier in addition to its other types.
  3. Activate Urza by paying {1}, creating a token copy of Crumbling Vestige that is a 1/1 Soldier in addition to its other types.
  4. When the Crumbling Vestige token enters the battlefield, it triggers, adding {1}.
  5. Repeat from step 3.[END OF COMBO STEPS]

Result:
  - Infinite enters the battlefield
  - Infinite landfall triggers
  - Infinite tapped creature tokens[END OF COMBO RESULT][END OF COMBO]

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