mtg how many cards in a booster box 7th Edition Opening: $2800 Foil Chase + Bonus Revised Pack including 1–2 card(s) of rarity Rare or higher and 3–5 Uncommon How Many Booster Packs Are

She's only an indestructible enchantment until your devotion to red and green is seven, at which point she also becomes a 4/5 creature

Panic High-Strung Imp is excellent, doing a very similar job

This means it's not possible to cheat creatures into play out of nowhere (which madness can do), but it also means you're granted more flexibility, because you can cast a spell for its mayhem cost at any point during the turn in which it was discarded (rather than having to choose immediately as per madness rules)

The card could also have been viewed as a simple "goodie" for visitors to D23 not accustomed to TCGs and card certification