Is Cleaving Skyrider legal in Standard, Modern, and Commander?

Cleaving Skyrider is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Cleaving Skyrider?

Cleaving Skyrider is a Creature — Human Warrior. Its oracle text reads: "Flash Kicker {2}{R} (You may pay an additional {2}{R} as you cast this spell.) Flying When this creature enters, if it was kicked, it deals X damage to any target, where X is the number of attacking creatures."