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If the permanent is sacrificed as a cost, you cannot exile it

Key Cards to initiate FTK Combo: Any two warriors for Isolde, Two Tales of the Noble Knights FTK2: Crystal Beast Gem-Knight Did anyone say GEMS

The downside is the lack of haste and a combat trigger in a world of fast ETB dragons

Once per turn: You can Special Summon 1 Dragon-Type monster from your hand or Graveyard, except "Red-Eyes Darkness Metal Dragon".

That being said, because Jaws is only target opponent, I doubt we see this seriously considered, otherwise it'd be an absolutely neat combo kill in Black

The life cost is at least usually negligible in this archetype