Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Whenever you cast a multicolored instant or sorcery spell from your hand, exile that spell instead of putting it into your graveyard as it resolves. If you do, it becomes plotted. (You may cast it as a sorcery on a later turn without paying its mana cost.)
Lilah is an Izzet spellslinger that turns your multicolored instants and sorceries into free recurring value: cast a gold spell, it gets plotted on resolution, then recast it next turn for free. You curve out cheap cantrips and burn to grow Lilah via prowess while stockpiling plotted gold spells, then unload a huge burst turn of free spells to burn out the table or push lethal commander damage.
Generates massive card and mana advantage by replaying multicolored spells for free
Prowess makes Lilah a fast, evasion-friendly clock with cheap spells
Low curve and deep cantrip support give consistent gameplay
Rewards a high spell density that doubles as interaction and removal
Only multicolored instants/sorceries get plotted, narrowing deck-building
Fragile commander that dies to spot removal, stalling the engine
Light on early board presence; weak to aggressive go-wide decks
Two colors means no access to broad removal or graveyard hate
Magecraft draws a card off each plotted recast, snowballing your hand.
Maximize multicolored instant/sorcery density and add magecraft payoffs like Archmage Emeritus and Veyran, Voice of Duality to double the value of each plotted recast. Add cost reducers and ritual-style mana (Storm-Kiln Artist, Birgi) to chain explosive turns, plus cheap protection (Swan Song, Deflecting Swat) to keep Lilah alive. Tighten the curve with efficient cantrips and tutors so you reliably stock plotted spells for a single lethal turn.