Rhuahk, Winged One

+1: Only creatures with flying can attack Rhuahk, Winged One until the end of your next turn.
-2: Tap up to 7 creatures, those creatures get X +1/+1 counters, where X is the number of creatures tapped this way.
-7: Roll a d10. Destroy all creatures with converted mana cost less than or equal to whatever you rolled.