Kou-Toa Archpriest

When Kou-Toa Archpriest attacks if targeted opponent has an island mana then Kou-Toa Archpriest get's +1/+1 until end of turn, if they
have a plains mana then Kou-Toa Archpriest get's -1/-1 until end of turn.
{3}{w}{p/b}: Gain 5 life.
If you control a creature whose converted mana cost is equal to 10 or greater than each creature you control gains +1/+1.