Goblin Explosioneer

At the beginning of combat on your turn, for
each set of square brackets, choose one at
random. Then you may pay {r}. If you do, repeat
this process and ignore the previous choices. Do
this no more than three times each turn—
Goblin Explosioneer gets [ -2/+2, +4/+0] until
end of turn, then it deals damage equal to its
power to [any target, each creature, itself, you].
"Throw it that way! No, no! That w—"