Plaxmanta

Creature — Beast    (CMC:2)

Flash When Plaxmanta enters the battlefield, creatures you control gain shroud until end of turn. (They can't be the targets of spells or abilities.) When Plaxmanta enters the battlefield, sacrifice it unless was spent to cast it.

Simic

29 DIS • ENAlan Pollack

™ & © 1993—2006 Wizards of the Coast

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

Oracle Text (click to copy):

Plaxmanta {1}{U} Creature — Beast Flash When Plaxmanta enters the battlefield, creatures you control gain shroud until end of turn. (They can't be the targets of spells or abilities.) When Plaxmanta enters the battlefield, sacrifice it unless {G} was spent to cast it. 2/2

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View this MTG card on Gatherer

5/1/2006
If this enters the battlefield in a way other than announcing it as a spell, then the appropriate mana can't have been paid, and you'll have to sacrifice it.  

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Card Plaxmanta is not on TCGPlayer.