Chakram Slinger
Partner with Chakram Retriever (When this creature enters, target player may put Chakram Retriever into their hand from their library, then shuffle.)
, 
: This creature deals 2 damage to target player or planeswalker.
Illustrated by Dmitry Burmak
This printing
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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.
"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."
A nonlegendary creature can't be your commander, even if it has a "partner with" ability.
