Roshanna, Stormy Top

Trample
When Roshanna becomes the target of an ability you don't control, you may pay {u}{g}. If you do, Roshannah does damage equal to her power to that ability's controller.
When Roshanna deals combat damage to a player, you may pay {2}{r}{r}. If you do, untap all creatures you control, and there is an additional combat phase after this one.