Ragnaros

(Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I Urza's Saga gains"{t} : Add {c} ."
II Urza's Saga gains"{2},{t}:Create a 0/0 colorless Construct artifact creature token with
'This creature gets 1/1 for each artifact you control.
III Search your library for an artifact card with
mana cost {0}or{1}, put it onto the battlefield, then shuffle.