Moonlight Greatsword

Equipped creature gets +2/+2 and has double strike, protection from blue, and reach.
Whenever equipped creature deals combat damage,
you may scry 2. If you do, draw a card. If equipped creature would die, you may unattatch Moonlight Greatsword instead.
Equip {3}
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When blue moonlight dances around the sword, and it channels the abyssal cosmos, its great blade will hurl a shadowy lightwave.