Deep Gem

{t}: Add {u} or {b}.
{u}{b}, {t}: Until end of turn, target creature you
control gains "Whenever this creature deals
combat damage to an opponent, Surveil 2 then
draw a card and lose 2 life."
A gem of infused titanite. Found in the dregs of the
Cathedral of the deep Used in infusion to deep
weapons. Deep weapons inflict dark damage, but lose scaling effects.