(As this Saga enters and after your draw step, add a lore counter.)
I — Exile the top three cards of your library. Until the end of your next turn, you may play those cards.
II — Add one mana of any color.
III — Exile this Saga, then return it to the battlefield transformed under your control.
Firebending 4 (Whenever this creature attacks, add . This mana lasts until end of combat.)
: Create a 4/4 red Dragon creature token with flying and firebending 4.
Cast The Legend of Roku as a 4-mana Saga that impulse-draws three cards, ramps a mana of any color, then flips into Avatar Roku, a value engine attacker. Roku's firebending 4 floods you with red mana each combat to deploy huge X-spells, refill from impulse draw, or stamp out 4/4 firebending Dragons, snowballing into an aggressive board that closes the game with burst mana.
Built-in card advantage and ramp before it even becomes a creature, smoothing your curve
Firebending 4 gives explosive bursts of mana every combat to power X-spells, big eldrazi, or repeatable Dragon tokens
Self-sufficient commander that rebuilds value if it dies and is recast as a Saga
Cheap at 4 mana and entirely mono-red, keeping the deck consistent and color-screw-proof
The Saga front side is slow and produces no board presence for several turns
Combat-dependent mana from firebending evaporates if Roku is blocked, chumped, or removed before damage
Mono-red lacks reliable enchantment/artifact-resilient card draw and struggles against heavy control
Firebending mana is colorless-aggressive but disappears at end of combat, so it can't be banked for instant-speed answers