Ar-Ceus, The Lost Magus

Skulk
Sage- As long as you have six or more cards in your hand, whenever this creature deals combat damage to an opponent, exile the top card of your library. You may cast that without paying it's
mana cost till end of turn and as you cast that spell it gains cascade.
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"There's a reason no one else knows what he knows.
No one seems to survive the training, not even him."-Narset , Master of the Forgotten Path.