Correct, any instant (or interrupt, if you have cards from expansions old enough to still have them) will work. Fireball is a sorcery and is slower, so instants/interrupts will resolve first.
You also have the potential to be scooped if you do not win the coin toss and don’t get the first turn. There are tons of single cost interrupts and various fast tweaky creatures that can deal small amounts of damage on the first turn, and all your opponent has to do is shave off one single point of life from you and this won’t work.
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Correct, any instant (or interrupt, if you have cards from expansions old enough to still have them) will work. Fireball is a sorcery and is slower, so instants/interrupts will resolve first.
You also have the potential to be scooped if you do not win the coin toss and don’t get the first turn. There are tons of single cost interrupts and various fast tweaky creatures that can deal small amounts of damage on the first turn, and all your opponent has to do is shave off one single point of life from you and this won’t work.