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A competitive power that meets extreme scarcity

Another possible rule 0 breaker might be Gruesome Fate

These are generally limited to more recent sets, but thats where a lot of people get their start, so its not a bad place at all to build a position

While in theory this can cause you to lose the game (as you saw in my match against Merfolk), the truth is it can almost always be played around, unless you run into the very rare situation where you have only the second Part the Waterveil left in hand and nothing to buy another turn, whether real or virtual

You may put it into your hand even if it's an artifact card