WorldKing

Flying, Vigilance, Indestructible, Trample,
Double Strike, Horsemanship, Deathtouch,
Flash, Hexproof, Haste, Lifelink, Menace,
Shroud, convoke
All other creatures become 1/1 frogs with defender
Search Library for every other card
All spells played by target player after this card are countered
All Lands are forests