Cheapest priced copy (Commander 2014): $0.49 at Card Kingdom, near mint, their price list as of .
Pentavus 
Artifact Creature — Construct · 0/0 · Rare · Planechase · #123
This creature enters with five +1/+1 counters on it.
{1}, Remove a +1/+1 counter from this creature: Create a 1/1 colorless Pentavite artifact creature token with flying.
{1}, Sacrifice a Pentavite: Put a +1/+1 counter on this creature.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
7 printings · $0.49 to $4.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2014 | 261 | Rare | $0.49 | — |
| Commander Anthology Volume II | 209 | Rare | $0.49 | — |
| Duel Decks: Elspeth vs. Tezzeret | 58 | Rare | $0.49 | — |
| Planechase | 123 | Rare | $0.49 | — |
| Magic 2012 | 213 | Rare | $0.49 | $0.49 |
| Mirrodin | 226 | Rare | $0.59 | $4.49 |
| The List | C14-261 | Rare | $0.49 | — |
2 rulings from Wizards of the Coast
- 22 September 2011You can sacrifice any Pentavite creature you control (such as an Adaptive Automaton with Pentavite as its chosen type) to activate Pentavus’s second activated ability, not just ones created by Pentavus’s other abilities.
- 22 September 2011You can remove any +1/+1 counter on Pentavus to activate its first activated ability, not just ones created by Pentavus’s other abilities.