How can you create a combo with Fleet Swallower, Fraying Sanity?
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[START OF COMBO]This combo can be formed with Fleet Swallower, Fraying Sanity

Color identity: U
Mana cost: 
Steps:
  1. Declare Fleet Swallower as an attacker.
  2. Fleet Swallower triggers, causing the opponent enchanted by Fraying Sanity to mill cards equal to half their library size, rounded up.
  3. At the beginning of your end step, Fraying Sanity triggers, causing the opponent to mill cards equal to the number of cards put into their graveyard this turn.[END OF COMBO STEPS]

Result:
  - Infinite mill for target opponent[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Fleet Swallower does not have summoning sickness.
  - Fraying Sanity is attached to an opponent.
[END OF COMBO PREREQUISITES]
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