How Does Transaction Rollback Work Really?
5,693Transaction Rollback has the effect to pay half your life points to copy the effects of normal trap cards. And generally this is pretty easy to parse, because a lot of trap cards just detail pure effects in their text (like Jar of Greed). However, what if the card has a cost or a condition?
If a card has a cost, rollback can just ignore that and do the effect. Take Fish Depth Charge for example, its cost is to tribute a fish monster. If you copy its effect with roll back, you can just destroy a card and draw. And you can tell a cost simply by the sentence before the semi-colon " ; ", or the dot over a comma. However, if a card has a targeting requirement in it, like depth charge does, your rollback will copy that requirement with its activation, so you'll be able to target a card to destroy, even though you ignore the rest of the text in the semi-colon, because targeting is technically not a cost.
Conditions are more tricky. These are usually denoted by the colon " : ", or the 2 dots on top of each other. Rollback cannot ignore the conditions, but as long as you meet the conditions, then you can copy the effect of the card. For example, Evenly Matched can only be activated at the end of the battle phase, so you can copy the effect from the GY, but only at the end of the battle phase.
Heavy Storm Duster has a condition after its effect, where you cant do your battle phase, which must be followed as well, even though its not listed in a colon.
However, you can ignore hard once per turn restrictions, because your only using the cards effect and not the card itself.
Editing by @ParfaitOperationalGuidebook
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