Cheapest priced copy (Magic 2015): $0.35 at Card Kingdom, near mint, their price list as of .
Wall of Limbs 
Creature — Zombie Wall · 0/3 · Uncommon · Magic 2015 · #121
Defender (This creature can't attack.)
Whenever you gain life, put a +1/+1 counter on this creature.
{5}{B}{B}, Sacrifice this creature: Target player loses X life, where X is this creature's power.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Magic 2015 | 121 | Uncommon | $0.35 | $0.99 |
| Tarkir: Dragonstorm Commander | 200 | Uncommon | $0.35 | — |
3 rulings from Wizards of the Coast
- 18 July 2014The ability triggers just once for each life-gaining event, whether it’s 1 life from Soulmender or 8 life from Meditation Puzzle.
- 18 July 2014If you gain life at the same time Wall of Limbs is dealt lethal damage (probably because you control a blocking creature with lifelink), Wall of Limbs’s triggered ability will trigger, but Wall of Limbs will be destroyed before the ability resolves.
- 18 July 2014Use Wall of Limbs’s power as it last existed on the battlefield, including any +1/+1 counters it had, to determine the value of X.