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Because exiling a card with foretell from your hand is a special action, you can do so any time you have priority during your turn, including in response to spells and abilities

One of the best options is Acolyte of Bahamut, which lets you discount Dragon spells since Dragons have a lot of attack triggers and Karlach provides extra combat steps

Examples include the FFXs Farewell or Protection Magic, Tifas Lightning Greaves, and basically anything with Cloud, like Arcane Signet 0333, Dispatch, or Clever Concealment

A Commander ban would lead to a dip in price, but its use by players is restricted by its scarcity (Reserved List), so I cant see that happening any time soon

If all that weren't enough, Seasoned Pyromancer remains useful even after it reaches the graveyard