Creature - Merfolk Wizard 1/1, U (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.
Illus. Igor Kieryluk
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.
Zendikar
(Rare)