Impulsive Pyromancers

{t}: Deal 1 damage to any target.
{r},{t}: Tap any number of Impulsive
Pyromancers you control: Deal X damage to any
target equal to the number of Impulsive
Pyromancers tapped this way. If X is 5 or more,
it deals double damage to target instead. If X is
10 or more , this damage can't be prevented.
A deck can have any number of cards named Impulsive Pyromancer.