Impetuous Protege {2}{R}

Creature — Human Warrior

Partner with Proud Mentor (When this creature enters, target player may put Proud Mentor into their hand from their library, then shuffle.)

Whenever Impetuous Protege attacks, it gets +X/+0 until end of turn, where X is the greatest power among tapped creatures your opponents control.

0/4

Illustrated by Jakub Kasper

Faces, Tokens, & Other Parts
Proud Mentor #20s
Impetuous Protege #19s

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The value of X is determined only as Impetuous Protege’s last ability resolves. Once that happens, the value of X won’t change later in the turn even if the greatest power among your opponents’ tapped creatures changes. (2018-06-08)
If the greatest power among tapped creatures your opponents control is negative, X is considered to be 0. The same is true if your opponents control no tapped creatures. (2018-06-08)
“Partner with [name]” represents two abilities. The first is a triggered ability: “When this permanent enters the battlefield, target player may search their library for a card named [name], reveal it, put it into their hand, then shuffle their library.” (2018-06-08)

Note that the target player searches their library (which may be affected by effects such as that of Stranglehold) and that the card they find is revealed, even though these words aren’t included in the ability’s reminder text. (2018-06-08)
A nonlegendary creature can’t be your commander, even if it has a “partner with” ability. (2018-06-08)