Mittens, Curious Companion

Partner to Shadow, Cautious Companion (When
this creature enters the battlefield, target player may
put Shadow, Cautious Companion into their hand
from their library, then shuffle.)
Players must always tell the truth while Mittens, Curious Companion is on the battlefield.
{3}{w}{w}{t}: Target player plays with their hand revealed until their next end step
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"I cannot tell a lie, it was mittens."
—Russ