RE: The My Little Pony: Friendship is Magic Not-Clan: 20% Cooler Than Official Clans
Vinyl Scratch.
Also, looking at Rarity again, you can use her second attack to basically prevent your opponent from being able to do anything. Have Rarity sit there as your Active Pony. Unless they can one-shot her, she can heal completely every turn, force the opponent to start decking themselves, and using her attack in combination with her PokeBody, she can essentially take two prizes anytime she defeats anypony. Example:
-Opponent attack Rarity for 70 damage
-Rarity removes 7 damage counters, opponent draws 7 cards
-Rarity attacks for 100 damage, knocking out opposing pony
-Rarity has no damage counters, allowing her to take two prize cards
-If they survive, they have to attack again, which can cause Rarity to make them draw more cards
-Meanwhile, if they don't attack, Rarity can just whittle them down with her attack, and because she's taken no damage again takes two prize cards
REPEAT FOR INFINITY
EDIT: Realized that the drawing is optional, but she's still incredibly broken even without the ability to deck.