Jex, Steel Manipulator

As Jex, Steel Manipulator enters the battlefield,
create a number of Blade tokens equal to half the
amount of mana spent to cast her rounded up.
(Blade tokens are artifacts with "{t}, sacrifice this
artifact: This artifact deals 1 damage to any target" )
At the beginning of your upkeep, if you control 5
or more artifacts with the same name, draw a card
{2}, {t}: Create a blade token