Sentry Oak

Creature — Treefolk Warrior    (CMC:5)

Defender At the beginning of combat on your turn, you may clash with an opponent. If you win, Sentry Oak gets +2/+0 and loses defender until end of turn. (Each clashing player reveals the top card of his or her library, then puts that card on the top or bottom. A player wins if his or her card had a higher converted mana cost.)

38 LRW • ENWarren Mahy

™ & © 1993—2007 Wizards of the Coast

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

Oracle Text (click to copy):

Sentry Oak {4}{W} Creature — Treefolk Warrior Defender At the beginning of combat on your turn, you may clash with an opponent. If you win, Sentry Oak gets +2/+0 and loses defender until end of turn. (Each clashing player reveals the top card of his or her library, then puts that card on the top or bottom. A player wins if his or her card had a higher converted mana cost.) 3/5

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View this MTG card on Gatherer

10/1/2007
Specifically, this ability triggers when the beginning of combat step starts during your turn.

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