: Spells you cast this turn that are black and/or red cost less to cast, where X is the amount of life you lost this turn. Activate only as a sorcery.
Rowan turns your own life total into a discount engine: deal yourself damage or attack/take damage, then tap Rowan to slash the cost of your black and red spells, often casting huge bombs or chaining multiple spells for free. You leverage life loss (fetches, painlands, shocks, self-damage) and aggressive combat to enable explosive turns. Close games by deploying an overwhelming board or comboing off with cheated-out spells.
Massive mana discounts enable casting expensive bombs early and chaining spells in one turn
Menace makes Rowan a reliable attacker who can carry equipment/auras
Synergizes with life-loss themes already common in Rakdos (fetchlands, painlands, Phyrexian mana)
Cheap commander (MV 3) that comes down early and impacts the game immediately
Discount only triggers off life YOU lost this turn, requiring setup before the tap
Pushing life total low makes you vulnerable to aggression and burn
Tap ability is sorcery-speed and one-shot, so no instant-speed surprises
Relies on Rowan staying alive; heavy creature removal shuts off the engine
Draws cards off life payments and is a huge body you can cheat out cheaply with Rowan's discount.
Add efficient life-loss enablers (fetchlands, painlands, Phyrexian mana spells) so Rowan's discount is online every turn, and pair them with payoff bombs and X-spells. Lean into life-as-resource pieces like Bolas's Citadel, K'rrik, and Vilis for explosive engines, and include protection (Lightning Greaves, Heroic Intervention) to keep Rowan alive. For maximum power, build toward a deterministic loop—Aetherflux Reservoir or infinite mana into Torment of Hailfire/Exsanguinate.
Legendary Creature — Human Wizard
: Spells you cast this turn that are black and/or red cost 
less to cast, where X is the amount of life you lost this turn. Activate only as a sorcery.