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A relatively cheap, resilient threat that provides mana and card advantage makes for a busted creature

Artifact Color tag templates(None) Blink (CTRL to add secondary) Clones Qty: 1 Price: $9.49 Glasspool Mimic You may have this creature enter as a copy of a creature you control, except it's a Shapeshifter Rogue in addition to its other types

you can't cast it without exiling a creature card, and you can't exile additional creature cards

Should it exist

With prowess, that's fairly easy to do, and Kitsa has so many keywords stapled on it that its bound to be an appealing option for any UR prowess or tempo strategies in upcoming Standard formats