How can you create a combo with Livio, Oathsworn Sentinel, Great Whale, Great Oak Guardian?
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[START OF COMBO]This combo can be formed with Livio, Oathsworn Sentinel, Great Whale, Great Oak Guardian

Color identity: GWU
Mana cost: 
Steps:
  1. Activate up to seven mana-producing lands by tapping them, adding at least {5}{W}{W}{W}.
  2. Activate Livio's first ability twice by paying {2}{W}{W}, exiling Great Whale and Great Oak Guardian with aegis counters on them.
  3. Activate Livio's second ability by paying {2}{W} and tapping it, returning Great Whale and Great Oak Guardian from exile to the battlefield.
  4. Great Oak Guardian and Great Whale enter the battlefield, triggering their abilities.
  5. Resolve the Great Whale trigger, untapping up to seven lands you control.
  6. Resolve the Great Oak Guardian trigger, untapping each creature you control and giving them +2/+2 until end of turn.
  7. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite blinking
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinitely large creatures until end of turn
  - Infinite mana creatures you control can produce
  - Infinite mana lands you control can produce
  - Infinite untap of creatures you control
  - Infinitely large creatures you control until end of turn[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Livio does not have summoning sickness.
  - You control up to seven lands that can tap to produce at least {5}{W}{W}{W}.
[END OF COMBO PREREQUISITES]
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