Cheapest priced copy (Mirrodin Besieged): $3.49 at Card Kingdom, near mint, their price list as of .
Myr Welder 
Artifact Creature — Myr · 1/4 · Rare · Mirrodin Besieged · #118
Imprint — {T}: Exile target artifact card from a graveyard.
This creature has all activated abilities of all cards exiled with it.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $3.49 to $4.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mirrodin Besieged | 118 | Rare | $3.49 | $4.99 |
3 rulings from Wizards of the Coast
- 1 June 2011If an activated ability of a card exiled with Myr Welder references the card it's printed on by name, treat Myr Welder's version of that ability as though it referenced Myr Welder by name instead. For example, if Lux Cannon (which says, in part, "{T}: Put a charge counter on Lux Cannon.") has been exiled by Myr Welder, Myr Welder has the ability "{T}: Put a charge counter on Myr Welder."
- 1 June 2011Activated abilities contain a colon. They're generally written "[Cost]: [Effect]." Some keywords are activated abilities; they have colons in their reminder text.
- 1 June 2011Myr Welder has only the activated abilities of cards it exiles. It doesn't gain triggered abilities or static abilities.