Uno Wild Draw Four

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When Uno Wild Draw Four enters the battlefield,
an opponent of your choice draws four cards. Then
name a color. During the chosen player's upkeep,
that player must exile a card of the chosen color
from their hand in a special pile. Then, starting
with the player after that player in the turn order,
each player must exile a card from their hand to
the special pile that shares a color with the last
card exiled for Uno Wild Draw Four.