Marut 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

Trample When this creature enters, if mana from a Treasure was spent to cast it, create a Treasure token for each mana from a Treasure spent to cast it. (It's an artifact with ", Sacrifice this token: Add one mana of any color.")

Complete guide

Marut is a massive Construct that rewards players for investing their resources wisely. By utilizing Treasure tokens to power this eight-mana threat, you can effectively refund your entire mana investment upon its arrival. This artifact creature offers both a trample-enabled offense and an immediate economic recovery.

What it Does

Marut is an 8-cost artifact creature with Trample. Its primary utility comes from its enters-the-battlefield triggered ability, which checks how many Treasure tokens were used to pay for its mana cost. If you used Treasure mana to cast Marut, the ability triggers and creates a matching number of Treasure tokens, essentially recycling your spent assets.

Step-by-Step Resolution

First, you must cast Marut and pay its cost of {8}. During this process, you track how many times you used mana generated by a Treasure token. Once Marut enters the battlefield, its ability is put on the stack. When that ability resolves, the game checks the recorded count of Treasure mana spent. You then create that many new Treasure tokens, which enter untapped and ready for use.

Common Mistakes

A common error is assuming Marut works when put onto the battlefield without being cast, such as through a reanimation effect. The ability only triggers if you actually spent mana from a Treasure to cast it. Furthermore, you only receive Treasure tokens for the mana actually produced by a Treasure; if you tap a land for mana, that does not contribute to the final count of tokens generated by the ability.

When to Play It

Marut is best played in decks that can generate a high volume of Treasure tokens early. Because it has Trample, it serves as a reliable finisher that doesn't deplete your resources, allowing you to follow up with more spells in the same turn or protect your board with the refunded mana.

Interaction examples

The Full Refund

Treasure

If you control eight Treasure tokens and sacrifice all of them to produce {8} to cast Marut, the ability will trigger upon entry. When the trigger resolves, you will create eight new Treasure tokens, leaving you with the same amount of mana you started with.

Sequence into Further Threats

Meteor Golem

You cast Marut using seven mana from Treasure tokens and one mana from a land. When Marut enters, you create seven new Treasure tokens. You can immediately sacrifice seven Treasure tokens to cast Meteor Golem, allowing you to destroy an opponent's permanent while still maintaining a massive board presence.

Artifact Synergy Overload

Myr Battlesphere

With Marut on the field, you have a large artifact creature with Trample. If you used Treasure to cast Marut, you can use those new tokens to help cast Myr Battlesphere. Both creatures contribute to your artifact count and provide powerful entering-the-battlefield effects that can overwhelm your opponent's defenses.

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