等時の王笏

刻印 ― 等時の王笏が戦場に出たとき、あなたはあなたの手札から点数で見たマナ・コストが２以下のインスタント・カード１枚を追放してもよい。
{2}, {T}：あなたはその追放されたカードをコピーしてもよい。そうしたなら、あなたはそのコピーをそのマナ・コストを支払うことなく唱えてもよい。

等时权杖

压印～当等时权杖进战场时，你可以从你手上放逐一张总法术力费用等于或小于2的瞬间牌。
{2}，{T}：你可以复制所放逐的牌。如果你如此作，你可以施放该复制品，且不需支付其法术力费用。

Isochron Scepter

Imprint — When Isochron Scepter enters, you may exile an instant card with mana value 2 or less from your hand.
{2}, {T}: You may copy the exiled card. If you do, you may cast the copy without paying its mana cost.

Mystery Booster 2

The List

Double Masters

Imprint — When Isochron Scepter enters the battlefield, you may exile an instant card with converted mana cost 2 or less from your hand.
{2}, {T}: You may copy the exiled card. If you do, you may cast the copy without paying its mana cost.

Eternal Masters

Magic Online Promos

If Isochron Scepter leaves the battlefield while the activated ability is on the stack, the ability can still make a copy. On the other hand, if the imprinted card leaves the exile zone while the activated ability is on the stack, the copy can't be made.

If a spell has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.

If you cast a spell “without paying its mana cost,” you can't choose to cast it for any alternative costs. You can, however, pay additional costs. If the card has any mandatory additional costs, those must be paid to cast the spell.

If you don't want to cast the copy, you can choose not to; the copy ceases to exist the next time state-based actions are checked.

You cast the copy while the ability is resolving and still on the stack. You can't wait to cast it later in the turn.