Theyre strongly related to mana production and creature numbers, and very strong cards like Rofellos, Llanowar Emissary, Leovold, Emissary of Trest, and Priest of Titania, not to mention the support like Gaea's Cradle or Craterhoof Behemoth
As if that wasnt good enough, the card is perhaps even better in Commander
It shows some actual restraint from design
This new Blue-Green bird creature gives all your other creatures an effect which activates whenever they're targeted with an ability
These Background cards affect commander creatures you control in some way or another depending on what the card does
In this case, whats needed is an understanding and acceptance of an existing archetype to shift the balance of power, redefine the spirit of the format, and provide new angles to Commander