Machinations of the Forge

When an artifact enter the battlefield under your control, you may draw a card. All artifacts have "Pay {2} : This artifact gains indestructible until your next turn"
{s}: When you roll {s} artifacts you control
Gain "Indestructible" and "{t}: Add 1 mana
of any color to your mana pool" for your next
2 turns. Draw a card.