Dosowyvern

Indestructible, flying, trample, double strike, and lifelink
Bestow {g/w}
{1}create {x}300,000,000,000/300,000,000,000 dodorexes with trample where {x} is the number of creatures your opponent controls
{10}wipe out all opponent's permanents
Enchanted creature gains 20/20 with flying, trample, double strike, and lifelink