Cosi's Trickster

Creature — Merfolk Wizard    (CMC:1)

Whenever an opponent shuffles his or her library, you may put a +1/+1 counter on Cosi's Trickster.

She watches the chaos created by the Roil, seeking strength in the patterns of anarchy.

45 ZEN • ENIgor Kieryluk

™ & © 1993—2009 Wizards of the Coast

Legal in: Modern,Zendikar Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Classic,Singleton 100,Commander

Oracle Text (click to copy):

Cosi's Trickster {U} Creature — Merfolk Wizard Whenever an opponent shuffles his or her library, you may put a +1/+1 counter on Cosi's Trickster. 1/1

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10/1/2009
Cosi's Trickster's ability triggers when an opponent shuffles his or her library because that player was instructed to do so by a spell or ability that specifically contains the word "shuffle" in its text or (in the case of a keyword ability) in its rules.
10/1/2009
The cascade ability doesn't cause a player to shuffle his or her library, even if that player revealed his or her entire library. The revealed cards are put on the bottom of their owner's library in a random order, but they're not "shuffled."
10/1/2009
If an opponent's library is empty or has just a single card in it when a spell or ability instructs that player to shuffle his or her library, Cosi's Trickster's ability will still trigger.

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Card Cosi's Trickster is not on TCGPlayer.