Whenever Golem, Temple Guardian would die, you may pay {B}{R}{G} and if you do, transform this card instead.

Sacrifice a creature: Golem deals 3 damage to target creature or planeswalker.

When this card transforms into Golem, Unleashed put a head counter on this card.

Golem, Unleashed gets +3/+3 if it has a head counter on it.

Remove a head counter: Create Head of Golem, a legendary 3/3 black, red and green golem creature token with flying and "When this card dies, put a head counter on Golem unleashed. "{T}: Sacrifice Head of Golem."