Her ability isn't quite the 'delightfully wed power and madness' that the flavour text implies, mreely manifesting in -1/-1 counters
If you cast Mirror Room, its a 3-mana spell on the stack, and its a 3-mana permanent on the battlefield
$1.29 Haven of the Spirit Dragon Tarkir: Dragonstorm Commander Decks $19.99 Urza's Incubator Modern Horizons 3 $0.35 Dragonstorm Globe Tarkir: Dragonstorm $1.99 Maelstrom of the Spirit Dragon Tarkir: Dragonstorm $3.99 Sarkhan's Triumph Dragons of Tarkir $3.49 Dragonlord Dromoka Tarkir: Dragonstorm Commander Decks $1.49 Sarkhan, Soul Aflame Tarkir: Dragonstorm Commander Decks $0.69 Crux of Fate Final Fantasy Commander Decks $3.99 Call the Spirit Dragons Tarkir: Dragonstorm $0.79 Carnelian Orb of Dragonkind Commander Legends: Battle for Baldur's Gate $5.49 Hellkite Courser Tarkir: Dragonstorm Commander Decks $13.99 Dracogenesis Tarkir: Dragonstorm 0 results found
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As we were land-centered, we liked the idea of caring about how many of a particular basic land you might have on the battlefield
If you are playing madness cards, reanimation synergies, or want a discard outlet for some other reason, the value goes way up