Xerath, Magus Ascendant

Xerath's abilities can only activate during your turn,
Xerath has+1/+1 for every tapped artifact you control.
{1}{u}{u}:deal damage equal to Xeraths power divided between any 2 targets, activatable once per turn.
{1}{u}, tap 2 artifacts: once per turn you may tap taget creature. Its controller taps 2 other targets of his choice.
{1}{u}{u}:creature doesn't untap at player's untap step.
targets can't be targeted again until your third upkeep.
{t}{5}{u}:deal damage