Derek, Levin-Maestro

Conduct - Each time an Instant is played, place
a +1/+1 counter on Derek, Levin-Maestro.

When Derek enters the battlefield, choose one creature type on the battlefield. Place a +1/+1 counter on each creature of that type.

{t}{x}{u/r}: X number of creatures with a +1/+1
token on it deals damage to itself equal to its
Power.