Kolghot's Golem

{t}{3}: If you control Kolghot, the Inevitable,
target creature gains flying and first strike.
If you control Kolghot, the Inevitable,
Kolghot's Golem gains +0 +5 and double strike.
Kolghot's Golem's power is equal to the
amount of the total mana cost of all creatures on
the board, divided by 3.