Flash
Kicker {2}{R} (You may pay an additional {2}{R} as you cast this spell.)
Flying
When Cleaving Skyrider enters the battlefield, if it was kicked, it deals X damage to any target, where X is the number of attacking creatures.
Cleaving Skyrider’s triggered ability counts all attacking creatures, even attacking creatures other players control.
In a Two-Headed Giant game, this triggered ability counts all attacking creatures that each attacking team controls.