Pentavus

Mana cost: {7}
Type: Artifact Creature — Construct
Power / toughness: 0 / 0
Set: Magic 2012 #213 (rare)
Price: $0.16 USD

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.

Pentavus has 7 printings, first in Mirrodin (2003). EDHREC ranks it #11,265 among Commander cards. It appears most in Omarthis, Ghostfire Initiate decks (1,078 on EDHREC). 2 public decks on TCG run it. It has 2 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: legal
pioneer: not legal
standard: not legal
brawl: not legal

Public decks that run Pentavus

Built from Scratch - Commander 2014, led by Daretti, Scrap Savant
Built from Scratch - Commander Anthology Volume II, led by Daretti, Scrap Savant

Commanders that run Pentavus most

Deck counts from EDHREC.

Omarthis, Ghostfire Initiate: 1,078 decks
The Capitoline Triad: 1,037 decks
Daretti, Scrap Savant: 431 decks
Kurkesh, Onakke Ancient: 61 decks
Mutagen Man, Living Ooze: 28 decks
Rosie Cotton of South Lane: 25 decks
Pia and Kiran Nalaar: 7 decks
Captain Jonathan Archer: 2 decks

Often played with Pentavus

Cards that show up in the same decks on EDHREC.

Rulings

2011-09-22: You 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.
2011-09-22: You can remove any +1/+1 counter on Pentavus to activate its first activated ability, not just ones created by Pentavus’s other abilities.