Crowning the King

(As this saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I: Create three 1/1 black Skeleton creature tokens with "{b}: Regenerate this creature."
II: Create five 1/1 black Skeleton creature tokens with "{b}: Regenerate this creature."
III: Put five +1/+1 counters on target creature.
It's name becomes "Reincarnated King Ur'Gath", it's legendary in addition to its other card types,
and it has "{b}: Regenerate this creature."