Cheapest priced copy (The List): $3.49 at Card Kingdom, near mint, their price list as of .
Arcbound Overseer 
Artifact Creature — Golem · 0/0 · Rare · Darksteel · #99
At the beginning of your upkeep, put a +1/+1 counter on each creature you control with modular.
Modular 6 (This creature enters with six +1/+1 counters on it. When it dies, you may put its +1/+1 counters on target artifact creature.)
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $3.49 to $10.99 at Card Kingdom
One ruling from Wizards of the Coast
- 25 September 2006If this creature gets enough -1/-1 counters put on it to cause its toughness to be 0 or less (or the damage marked on it to be lethal), modular will put a number of +1/+1 counters on the target artifact creature equal to the number of +1/+1 counters on this creature before it left the battlefield.