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Having the added ability to counter a spell or bounce an annoying creature also works in some situations

Quasiduplicate Quasiduplicate lets you snag a few copies of your best creature, which can be quite impactful in battlecruiser decks

However, the Voltorb [Cosmos Professor Program] is even more elusive, with only 12 (yes, 12 ) given out in total

This isnt an unrestricted extra combat since you only untap two creatures, but its still very cheap, and Magic has plenty of creatures like Otharri, Suns' Glory or Eldrazi that are worth getting an extra swing with

If it's cards, you don't necessarily need to jump to grading them