Some planes will let you draw cards, while others can destroy everything in play when you encounter it
'Penny Arcade' (Penny Arcade: Shitty webcomics) Hilarious concept, but horrible card
Alongside being an obvious staple in Commander, Faerie Mastermind is also a powerhouse in multiple other formats
The draw advantage this card will bring to black decks may take a few of the competitive ones over the top
Her counter ability can target herself, so as you cast protection, Equipment, and Auras you grow your commander and give it evasion
They're equally satisfied by an artifact you sacrificed to pay a cost, a creature you controlled that was destroyed by Cast Down, or an enchantment you returned to your hand with Cyclonic Rift