To properly support an early Natural Order pick, you need a lot of Llanowar Elves (any one-mana green creature that taps to produce mana) and a few big green creatures to search up
Dargo, the Shipwrecker Sacrificing more permanents lessens the impact commander tax has on Dargo, the Shipwrecker
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
Blue has many cards with strong enters abilities like Quantum Riddler and Tishana's Tidebinder that thrive alongside flicker spells like Essence Flux and Ghostly Flicker to get the most for your mana
As long as your devotion to red and green is less than seven, Xenagos isnt a creature
Creature - Mole Badger Bumi, Eclectic Earthbender When Bumi enters, earthbend 1