You know when to board wipe based on these important considerations: How many creatures are you removing, how much danger are you in, and do you benefit
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However, the payoff is massive, especially as it exiles cards, which stops other players from bringing them back again
What Time Wipe does is prevents any sort of card disadvantage when you play your own creature out in order to encourage the opponent to further play into your board wipe
Most Magic cards have one, but it is missing in some editions, such as Ice Age
Gengar VMAX (Alternate Art) Fusion Strike ($400) You may recognise this card from our most valuable Gengar cards list, where it managed to rank higher than even the very first Gengar cards ever printed, in terms of its price