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Exquisite Firecraft

Exquisite Firecraft deals 4 damage to any target.
Spell mastery — If there are two or more instant and/or sorcery cards in your graveyard, this spell can't be countered.

Pioneer Masters

Time Spiral Remastered

Magic Online Promos

Magic Origins Promos

Check to see if there are two or more instant and/or sorcery cards in your graveyard as the spell resolves to determine whether the spell mastery ability applies. The spell itself won't count because it's still on the stack as you make this check.

A spell or ability that counters spells can still target Exquisite Firecraft. When that spell or ability resolves, Exquisite Firecraft won't be countered if its spell mastery ability applies, but any additional effects of the countering spell or ability will still happen.