Theran Baggins, Burglar Adept

{x}{r/w}: Target artifact or blocking creature with
converted mana cost {x} loses all abilities and
becomes an Equipment artifact with "Equipped creature gets +X/+0, where X is this permanent's converted mana cost," and equip {x}. Attach that permanent to Theran for as long as you control it.
Only activate this ability if Theran attacked this
turn.
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"We tried to arrest him once for shoplifting....literally."
- Sir Michael