Steel Hellkite MVY-7.0

Big target (This creature can't be blocked except by creatures with flying or reach.)
{2}: Steel Hellkite MVY-7.0 gets +1/+0 until end of turn.
{x}: Destroy each nonland permanent with converted mana cost X whose controller was dealt combat damage by Steel Hellkite MVY-7.0 this turn. Activate this ability only
once each turn.