How can you create a combo with The Fifth Doctor, Adric, Mathematical Genius?
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[START OF COMBO]This combo can be formed with The Fifth Doctor, Adric, Mathematical Genius

Color identity: WU
Mana cost: 
Steps:
  1. At the beginning of your end step, The Fifth Doctor triggers.
  2. Holding priority, activate mana-producing creatures you control by tapping them, adding at least {2}{U}.
  3. Activate Adric's first ability by paying {2}{U} and tapping them, copying the Fifth Doctor's trigger.
  4. Resolve the copied triggered ability, untapping all creatures you control that didn't enter or attack this turn and putting a +1/+1 counter on each them.
  5. Repeat from 2.[END OF COMBO STEPS]

Result:
  - Infinite +1/+1 counters on all creatures you control except ones that attacked or entered the battlefield this turn
  - Infinite mana creatures you control can produce except ones that attacked or entered the battlefield this turn
  - Infinite untap of creatures you control except ones that attacked or entered the battlefield this turn[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - You control creatures that together can tap for at least {2}{U} and didn't attack or enter this turn.
  - Adric didn't enter this turn.
[END OF COMBO PREREQUISITES]
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