Mono-Red, in particular, does use a colourless mana source in Faceless Haven, which can transform into a 4/3 creature
Summon: Fenrir is an ideal ramp spell for Saga Tribal because it has similar utility to Rampant Growth (which is a top staple) at I, while its other abilities are less relevant, but also useful
Its also an eternally developing tale about planeswalkers, fanciful worlds, intense conflicts, and more
Its adventure, Free the Fae, lets players put either an instant, sorcery, or Faerie card into their hand upon milling four cards
It's been out for a few days now and I've gotten a chance to review it a few times
Youre in the correct color, and with one land per turn being a fundamental rule of Magic, it's surprising how often you trigger a second landfall (thank you Evolving Wilds)