Patagia Viper

Creature — Snake    (CMC:4)

Flying When Patagia Viper enters the battlefield, put two 1/1 green and blue Snake creature tokens onto the battlefield. When Patagia Viper enters the battlefield, sacrifice it unless was spent to cast it.

Simic

89 DIS • ENChristopher Moeller

™ & © 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):

Patagia Viper {3}{G} Creature — Snake Flying When Patagia Viper enters the battlefield, put two 1/1 green and blue Snake creature tokens onto the battlefield. When Patagia Viper enters the battlefield, sacrifice it unless {U} was spent to cast it. 2/1

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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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