Manaplasm

Creature - Ooze 1/1, 2G (3)
Whenever you cast a spell, Manaplasm gets +X/+X until end of turn, where X is that spell's converted mana cost.¹
Urak froze when he heard it. That was his first mistake. He turned and cast a dramatic ward spell. That was his last.
Illus. Daarken

Gatherer Card Rulings [Nov 2009]

• 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 {X} 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 {X}{R}) and choose a value of 5 for that X, then your Manaplasm will get +6/+6 until end of turn.

Format Legality	Legal in Vintage, Legacy, Extended, Standard, MTGO Classic
Printings (1/9)	Shards of Alara (Rare)