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Every sheet printed includes those colors on the side, but this is the first time I've ever seen them make it onto a card
Its a really fun concept, and while wed rather this was a Sultai card so we could also include the almighty The Gitrog Monster, well take what we can get
If you dont want to look too hard for creatures that inherently have haste, this also isnt a problem, as you can simply give all of them haste with cards like Fervor, Concordant Crossroads, Rhythm of the Wild, or Fires of Yavimaya, making construction of a deck revolving around this card or Ogniss inclusion in a similarly aggressive deck quite manageable
If you do, return this card from your graveyard to the battlefield tapped and attacking with a +1/+1 counter on it