Vault GuardsmanHow it works & interactions with other cards

Understanding Convoke

Vault Guardsman costs six mana, which is a steep investment. However, Convoke allows you to tap any number of creatures you control to pay for its mana cost. Each creature you tap pays for {1} or one mana of that creature's color. This means if you tap a white creature, it can pay for the {W} in the cost or the generic {5}. Tapping creatures for Convoke is not an activated ability; it is part of the process of paying for the spell, and you can even tap creatures that have 'summoning sickness' to help cast it.

Step-by-Step Resolution

When Vault Guardsman enters the battlefield, its triggered ability goes on the stack, and you must choose a target artifact or creature an opponent controls. If the target is legal when the ability resolves, that permanent is exiled. This is a single 'until' ability, meaning the duration is set immediately. As soon as Vault Guardsman leaves the battlefield—whether it is destroyed, exiled, or bounced to your hand—the exiled card returns to the battlefield immediately as a state-based action. It does not use the stack to return.

Timing and Strategy

Because Vault Guardsman is an artifact creature, it is more vulnerable to removal than a standard creature. If an opponent destroys Vault Guardsman while its triggered ability is still on the stack (before the exile happens), the target will never be exiled at all. To maximize its value, play it when you have a wide board to reduce its cost and target high-impact permanents that your opponent cannot easily get back.

Interaction examples

Handling Constant Threats

Psychosis Crawler

If your opponent controls a Psychosis Crawler that is becoming dangerously large, you can cast Vault Guardsman by tapping your creatures. Upon entering, you target Psychosis Crawler with the exile ability. The Crawler is removed from the field, stopping its life-loss trigger and its presence as a creature. If the Guardsman is later destroyed, the Crawler returns to the battlefield as a new object, and its power/toughness will be recalculated based on the opponent's current hand size.

Recursive Synergies

Sun Titan

While Sun Titan cannot return Vault Guardsman directly from the graveyard (as the Guardsman has a mana value of 6), they work well together on the battlefield. You can use Sun Titan to attack, and because it has Vigilance, it remains untapped. After combat, you can then tap the Sun Titan to help pay for Vault Guardsman via Convoke, effectively using the Titan's high power to both deal damage and contribute mana in the same turn.