How can you create a combo with The Tenth Doctor, Chronozoa, Mana Echoes?
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[START OF COMBO]This combo can be formed with The Tenth Doctor, Chronozoa, Mana Echoes

Color identity: UR
Mana cost: {7}, plus an additional {1} available if you control exactly one additional Illusion, or an additional {3} available if you do not control another Illusion
Steps:
  1. Activate The Tenth Doctor by paying {7}, causing you to time travel three times, removing all time counters from each Chronozoa you control.
  2. Each Chronozoa triggers.
  3. Resolve the first trigger, causing you to sacrifice the triggered Chronozoa.
  4. When Chronozoa dies, it triggers, creating two token copies of itself that each enter with three time counters.
  5. When the Chronozoa tokens enter the battlefield, they trigger, adding {C}{C} for each Illusion you control.
  6. Repeat from step 3 for each remaining trigger, if applicable.
  7. Repeat from step 1.[END OF COMBO STEPS]

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

Other prerequisites:
  - All permanants must be on the battlefield
  - Chronozoa has at least one time counter on it.
[END OF COMBO PREREQUISITES]
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