When designing cards for planes like Belenon that have so few references, we had to extrapolate from what was public knowledge
The D&D Movie Get Into Character By Playing the Game During the press briefing for the set, Sarra Scherb, a Copywriter for Wizards of the Coast, revealed that she DM'd a two-hour session for the cast and directors of the film, minus Grant, before the start of filming
Unfortunately, blue really gets the short end of the stick compared to colors like green, white, or even red when it comes to both permanent mana ramp and temporary mana acceleration
They witnessed their newly-hatched sister Merrevia Sal being killed by humans and their dogs
Boros Signet [Vampire deck]: Stable mana
I also really like it for decks like Isshin or that regularly take extra combats, as it helps to squeeze ever more value out of attacking