When Rosheen enters, mill six cards. You may put a card with in its mana cost from among them into your hand.
: Reveal any number of cards with in their mana cost in your hand. Add for each card revealed this way. Spend this mana only on costs that contain .
Rosheen is a dedicated X-spells matters deck that ramps hard, builds a critical mass of cards with in their cost, then dumps colorless mana into one or two backbreaking X-spells to draw, burn, or make an army. You fill your hand with X-cards via her ETB mill-to-hand and tutors, then tap her for huge bursts of mana to fuel game-ending spells. Win by overloading a single X-spell that either deals lethal, generates an overwhelming board, or refills your hand into a second haymaker.
Generates massive bursts of colorless mana that can dwarf your normal land count
X-spells scale into the late game, so flooding actually helps you
Deep, flexible toolbox of X effects: removal, burn, ramp, card draw, and tokens
Gruul has excellent ramp to reach Rosheen's payoff quickly
Rosheen's mana only works on costs containing , so it can't pay generic activated/commander tax or off-theme spells
Heavily reliant on the commander; if she's removed or repeatedly taxed, the engine stalls
Lacks interaction outside of X-burn—weak to counterspells, fast combo, and resilient stax
Mono-target X-spells get punished by fog, lifegain, or protection at the worst moment
Legendary Creature — Giant Shaman
in its mana cost from among them into your hand.
: Reveal any number of cards with 