Kargorval, friend of bolas

Flying, Give (Whenever this creature attacks
your health is equal to its power until
end of turn.) During your Upkeep you
gain 1 mana of any color
{x}{t}, Target player gains or loses {x} life
{b}, Kargorval, friend of bolas gains
hexproof and +3/+3
until end of turn. If 6 other Dragons with
converted mana cost 3 or more are on the
table under your control you win the game