Undying Courage

Flare; Pay 3 life. (You may cast this spell by instead paying its Flare cost. If you do, it gains Flash.)
Target creature gains protection from a color of
your choice until end of turn and gains
"Whenever this creature deals damage to a player,
its controller may shuffle five target cards from
their graveyard into their library".
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"Until the bitter end." Taizen, the Last Ronin.