Input your probabilities like this: Press calculate, and check for your answer here: Mulligans and Future Rounds We can use a combination of both of these calculators to figure out the probability of drawing a card by a certain round taking mulligans into account
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This creature could get paired with cards like Thousand-Year Elixir or Intruder Alarm to untap this multiple times for more than one counterspell a turn
You may choose new targets for the copies you control