Pentavus

Pentavus enters with five +1/+1 counters on it.
{1}, Remove a +1/+1 counter from Pentavus: Create a 1/1 colorless Pentavite artifact creature token with flying.
{1}, Sacrifice a Pentavite: Put a +1/+1 counter on Pentavus.

The List

Commander Anthology Volume II

Pentavus enters the battlefield with five +1/+1 counters on it.
{1}, Remove a +1/+1 counter from Pentavus: Create a 1/1 colorless Pentavite artifact creature token with flying.
{1}, Sacrifice a Pentavite: Put a +1/+1 counter on Pentavus.

Commander 2014

Pentavus enters the battlefield with five +1/+1 counters on it.
{1}, Remove a +1/+1 counter from Pentavus: Put a 1/1 colorless Pentavite artifact creature token with flying onto the battlefield.
{1}, Sacrifice a Pentavite: Put a +1/+1 counter on Pentavus.

Magic 2012

Duel Decks: Elspeth vs. Tezzeret

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

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.