Garurumon, Tundra Stalker

Partner with Matt Ishida, Crest of Friendship
(When this creature enters the battlefield, target player
may put Matt Ishida into their hand from their
library, then shuffle.)
Garurumon, Tundra Stalker can't be blocked.
When Garurumon leaves the battlefield, it deals
X damage to target player and you gain X life,
where X is its power.