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This would presumably make cards only played by more experienced or dedicated Brawl players, rank heavier than more popular cards, regardless of their true power levels

Rare: 26 types

Cavern of Souls first debuted in Avacyn Restored and has seen a small handful of reprints since

Double Strike vs Indestructible A creature with indestructible cant be destroyed in the normal way with combat damage or by abilities that say destroy on them

Final result: about 2^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^30

Grim Servant A creature that tutors when it enters is incredibly powerful because there are so many ways to make a creature enter the battlefield again and again