The only requirement here is that you use mana from an artifact to cast your spells
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If you are somehow generating one toughness tokens then it is incredibly efficient but even when your not it still offers great value and a variety of applications above and beyond pure card advantage
There were no real limits, and the only caveat was that the cashiers removed the plastic wrapping from the boxes to stop them from being resold
But Magics designers havent always delivered the fair cards that players desire
Second, the card opened up a very interesting area of design space, an area I call push your luck cards