Soultether Golem is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Vanishing 1 (This creature enters with a time counter on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.) Whenever another creature you control enters, put a time counter on this creature.

Complete guide

Soultether Golem is a fragile yet resilient artifact creature that thrives on the presence of your other mechanical allies. By utilizing the Vanishing keyword, it puts your deck on a clock, but its ability to refuel its own life force makes it a unique addition to creature-heavy strategies.

What Soultether Golem Does

Soultether Golem features two distinct abilities that work in tandem. First, Vanishing 1 means it enters the battlefield with a single time counter. At the start of your upkeep, you must remove a counter; if the last counter is removed this way, the creature is sacrificed. However, its second ability allows it to stay on the battlefield indefinitely as long as you continue to bring other creatures under your control.

Step-by-Step Resolution

When Soultether Golem enters, it gains one time counter immediately. During your upkeep, the Vanishing trigger goes on the stack to remove a counter. If the Golem has only one counter, removing it triggers the sacrifice clause. To prevent this, you must resolve the triggered ability that adds time counters whenever another creature enters the battlefield under your control before the upkeep trigger takes the final counter.

Common Mistakes

A common error is forgetting that the sacrifice trigger only happens when the last counter is removed by the Vanishing ability itself. If the Golem has no counters because they were removed by another effect, or if it simply never had any, it won't be sacrificed until the Vanishing trigger specifically removes the 'last' one. Also, remember that the counter-adding ability triggers for any creature entering, not just artifact creatures.

When to Play It

This card is most effective in decks that can consistently cast cheap creatures or generate tokens. Because it is a 3/3 for only two mana, it provides an aggressive body that can be maintained as long as you have a steady stream of reinforcements to keep its time counters replenished.

Interaction examples

Extending the Timer

Ornithopter of Paradise

With Soultether Golem on the battlefield with one counter, you cast Ornithopter of Paradise. When Ornithopter of Paradise enters, Soultether Golem's second ability triggers, putting a second time counter on it. Now, when your next upkeep begins, you will remove one counter, leaving one behind, and the Golem will stay on the battlefield.

Reducing Costs for Rapid Growth

Foundry Inspector

If you have Foundry Inspector on the battlefield, Soultether Golem costs only one mana to cast. Once the Golem is out, every subsequent artifact creature you cast will also be cheaper, making it much easier to flood the board and stack multiple time counters on the Golem to ensure it never has to be sacrificed.

Guide written with AI from the official text and rulings. Official English text prevails.