How can you create a combo with Lae'zel, Vlaakith's Champion, Jace, Cunning Castaway, Oath of Teferi?
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[START OF COMBO]This combo can be formed with Lae'zel, Vlaakith's Champion, Jace, Cunning Castaway, Oath of Teferi

Color identity: WU
Mana cost: {1}{U}{U}
Steps:
  1. Cast Jace by paying {1}{U}{U}.
  2. Jace enters the battlefield with four loyalty counters due to Lae'zel.
  3. Activate Jace's first loyalty ability by putting two loyalty counters on it, causing you to loot whenever you deal combat damage to a player this turn.
  4. Activate Jace's third loyalty ability by removing five loyalty counters from it, creating two non-legendary copies of Jace, which enter with four loyalty counters each due to Lae'zel.
  5. Repeat from step 3 using a Jace token.
  6. Once you have infinite Jace tokens, you may activate their second loyalty abilities by removing two loyalty counters from them, creating infinite 2/2 Illusion creature tokens.[END OF COMBO STEPS]

Result:
  - Infinite creature tokens
  - Infinite enters the battlefield
  - Infinite Jace, Cunning Castaway tokens[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Lae'zel, Vlaakith's Champion must be on the battlefield
  - Jace, Cunning Castaway must be in your hand
  - Oath of Teferi must be on the battlefield
[END OF COMBO PREREQUISITES]
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