A lot nicer than you'd probably expect, being a ruler and all but he's certainly got some other unique properties too. Here's his card's info:
RABS-EN056:
My Little Pony Ruler of Rainbows
LIGHT / Pony / Level 12 / ATK 5000 / DEF 4500
Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand) by sending all cards in your hand and that you control to the Graveyard (min 6 from each) and cannot be Special Summoned by other ways. "My Little Pony" monsters, except "My Little Pony Ruler of Rainbows" gain ATK equal to half their original (printed ATK), also their effects are negated. Once per turn, when your opponent activates an effect that would target or destroy a "My Little Pony" monster(s) on the field: You can pay 1000 LP. negate the activation, and if you do, banish it. You can only control 1 "My Little Pony Ruler of Rainbows".
Ultra Rare