Manaplasm

Creature — Ooze    (CMC:3)

Whenever you cast a spell, Manaplasm gets +X/+X until end of turn, where X is that spell's converted mana cost.

Urak froze when he heard it. That was his first mistake. He turned and cast a dramatic ward spell. That was his last.

138 ALA • ENDaarken

™ & © 1993—2008 Wizards of the Coast

Legal in: Modern,Shards of Alara Block,Legacy,Vintage,Commander

Oracle Text (click to copy):

Manaplasm {2}{G} Creature — Ooze Whenever you cast a spell, Manaplasm gets +X/+X until end of turn, where X is that spell's converted mana cost. 1/1

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View this MTG card on Gatherer

10/1/2008
Converted mana cost takes into account only the mana symbols printed in the upper right corner of the card. Manaplasm doesn't care about additional costs, alternative costs, cost-reduction effects, or what you actually paid to cast the spell.
10/1/2008
While a spell with  in its cost is on the stack, its converted mana cost takes the chosen value of X into account. For example, if you cast Blaze (a spell with the mana cost ) and choose a value of 5 for that X, then your Manaplasm will get +6/+6 until end of turn.

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Card Manaplasm is not on TCGPlayer.