仕組まれた爆薬 {X}

アーティファクト

烈日（これのコストのために支払われたマナの色１色につき１個の蓄積カウンターが置かれた状態で場に出る。）

{2}, 仕組まれた爆薬を生け贄に捧げる：仕組まれた爆薬の上に置かれた蓄積カウンターの数と同じ点数で見たマナ・コストを持つすべての土地でないパーマネントを破壊する。

Illustrated by Ron Spears

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Only the English version of a Magic card receives Oracle updates and errata. View this card in English. (Scryfall note)
You can choose any value for X as you cast Engineered Explosives. The value chosen for X doesn't directly affect the number of charge counters Engineered Explosives enters the battlefield with, but it does let you pay more mana and thus spend more colors of mana to cast it. (2020-08-07)
Colorless mana won't give Engineered Explosives another charge counter. Colorless is not a color. (2020-08-07)

Tokens that aren't a copy of something else don't have a mana cost. Anything without a mana cost normally has a mana value of 0. (2020-08-07)
If a permanent has {X} in its mana cost, X is considered to be 0. (2020-08-07)