How can you create a combo with Underworld Breach, Frantic Search, Brain Freeze, High Tide?
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[START OF COMBO]This combo can be formed with Underworld Breach, Frantic Search, Brain Freeze, High Tide

Color identity: UR
Mana cost: {U}
Steps:
  1. Cast High Tide by paying {U}.
  2. Activate up to three Islands by tapping them, adding {U}{U}{U}.
  3. High Tide triggers three times, adding {U}{U}{U}.
  4. Cast Brain Freeze for its escape cost by paying {1}{U} and exiling three other cards from your graveyard.
  5. Brain Freeze's storm ability triggers, copying Brain Freeze for each spell you've cast before it this turn, with one copy targeting you and all remaining copies targeting any player(s).
  6. Resolve all Brain Freezes, causing you to mill six cards, and each player to mill three cards for each Brain Freeze that targeted them.
  7. Cast Frantic Search for its escape cost by paying {2}{U} and exiling three other cards from your graveyard, causing you to loot twice and untap three Islands.
  8. Repeat.
  9. Once you have milled your entire library, you may use the remaining {U} to cast Brain Freeze repeatedly targeting your opponents.[END OF COMBO STEPS]

Result:
  - Near-infinite blue mana
  - Near-infinite draw triggers
  - Near-infinite looting
  - Near-infinite magecraft triggers
  - Near-infinite mill
  - Near-infinite self-discard triggers
  - Near-infinite self-mill
  - Near-infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Underworld Breach must be on the battlefield
  - Frantic Search must be in the graveyard
  - Brain Freeze must be in the graveyard
  - High Tide must be in your hand
  - You have at least three other cards in your graveyard.
  - You control at least three Islands.
[END OF COMBO PREREQUISITES]
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