Rhino, Rampager

Rhino, Rampager can't be blocked by
creatures with 2 power or less.
Whenever Rhino, Rampager attacks, you
may pay {2}{r}. If you do, double Rhino,
Rampager's power until end of turn.
I'm Rhino. I knock things down.
That's what I do. That's who I am.