Since a spell with Spell Mastery is on the stack when it checks to see if its extra ability applies, it will not count towards the two that are required. Spell Mastery cards will either replace part of a cards text or give the card an additional ability.
Also, since a spell with spell mastery checks for the condition as it resolves, it’s possible to remove cards from the graveyard in response to “turn off” spell mastery before the spell resolves, thus reducing its potency.
Remember, each card with the spell mastery ability is different so make sure you read your card and you should be good to go!
Today’s Rules Tip written by Daniel Clarke