Tog, Tinkerer

Whenever you cast an Artifact spell with CMC
0-3, create an X/X artifact servo creature token.
Whenever you cast an Artifact spell with CMC
4-6, draw a card. Whenever you cast an Artifact
spell with CMC 7 or more, reveal the top card of
your library until you reveal an Artifact with
converted mana cost less than 7. Exile that card,
you may cast it withough paying it's mana cost
until end of turn. Put the rest of the cards on the
bottom of your library in any order.