Chojuro, Mizukage's Guard

When Chojuro, Mizukage's Guard enters
the battlefield, you may search your library
for a Mizukage card. Reveal it, then put it in
your hand. Shuffle your library.
Chojuro, Mizukage's Guard has first strike
as long as you control a Mizukage planeswalker.
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"I will do everything to protect that smile
on our gentle Mizukage."