Bag of Crafting

{t}Sacrifice any number of tokens or token
creatures. Put crafting counters on Bag of
Crafting equal to the amount of tokens sacrficed
this way.
{t} Remove 8 crafting counters from Bag of
Crafting. Draw a card. If it is an artifact or
artifact creature, you may reveal it & cast it
without paying it's mana cost. If not, you may
reveal the card and put crafting counters on Bag
of Crafting equal to it's mana value. Lands
revealed this way count as one mana.