tribal buff cards mtg General - Generic | Riptide Lab Tribal Flames — Invasion (INV)

Or you could just play cards like Ashling, the Extinguisher or Draugr Necromancer or Elusive Tormentor and get a 4/4 black creature for four mana with all upside and no drawbacks

Bear that in mind when experimenting with this format outside of EC rules

Traveling Chocobo's last ability affects a permanent's own "enters" triggered abilities (as long as it's a land or Bird you control) as well as other triggered abilities that trigger when a land or Bird you control enters the battlefield

The energy mechanic was introduced in Kaladesh, and it has returned a few times since, with a notable surge of energy cards in Modern Horizons 3