Whats the difference between an instant and an interrupt?
Interrupts resolve as soon as they are successfully cast. Instants, on the other hand, must wait for both players to respond with any other instants. Once everyone has finished playing instants, the instants resolve one at a time in last-in, first-out order. Each effect resolves completely before going on to the next effect, except that no damage is actually dealt until all of the effects have finished resolving. Also, if a creature’s toughness is lowered, play¬ers don’t check to see if lethal damage has been dealt to the crea¬ture until the batch has finished resolving. Also, instants cannot cancel or counter other effects. For example, if I cast Lightning Bolt (an instant) on your Scryb Sprites (1/1), the Sprites will take 3 damage. If you respond by casting Giant Growth on the Sprites (+3/+3 until end of turn), the Giant Growth resolves first, then the Sprites takes 3 damage from the Lightning Bolt, so the creature survives and is equivalent to a 4/4 creature with 3 damage until the
