Moseo, Vein's New Dean 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
Flying When Moseo enters, create a 1/1 black and green Pest creature token with "Whenever this token attacks, you gain 1 life." Infusion — At the beginning of your end step, if you gained life this turn, return up to one target creature card with mana value X or less from your graveyard to the battlefield, where X is the amount of life you gained this turn.
Complete guide
Moseo, Vein's New Dean is a powerful new engine for Golgari and Orzhov decks, bridging the gap between life gain strategies and graveyard recursion. By leading an army of Pests, this Bird Skeleton Warlock ensures that every point of life you gain translates into returning fallen allies to the battlefield.
Understanding Infusion
Moseo's primary strength lies in the Infusion ability, which triggers at the beginning of your end step. This ability checks the total amount of life you gained during the current turn to determine the mana value limit for a creature card you want to return from your graveyard. Importantly, the ability only triggers if you have already gained life before the end step begins; you cannot gain life during the end step to trigger it retroactively.
Step-by-Step Resolution
First, Moseo enters the battlefield and creates a 1/1 black and green Pest token. When that token attacks, you gain 1 life, which satisfies the condition for Infusion. During the beginning of your end step, the game checks if your life total increased at any point this turn. If it did, the Infusion ability is put on the stack and you choose a target creature card in your graveyard. As the ability resolves, it compares the target's mana value to the total life gained; if the mana value is less than or equal to that total, the creature returns to the battlefield.
Strategic Timing and Common Pitfalls
A common mistake is forgetting that Infusion looks at the total life gained, not your net life total change. If you gained 5 life but also lost 5 life, X is still 5. Additionally, be aware that if a creature card in your graveyard has {X} in its mana cost, that X is treated as 0. Always ensure your life gain triggers occur during your main phases or combat so that Moseo is ready to trigger when you pass the turn.
Interaction examples
Moseo, Vein's New Dean
Pest
Solemn SimulacrumIf you attack with the Pest token created by Moseo, Vein's New Dean, you gain 1 life. At your end step, Moseo's Infusion ability triggers because you gained life. If Solemn Simulacrum is in your graveyard, however, you cannot return it because its mana value is 4, which is greater than the 1 life you gained. You would need to gain at least 4 life total during the turn to bring back the Golem.
Roaming ThroneIf you have Roaming Throne on the battlefield with 'Bird', 'Skeleton', or 'Warlock' chosen, and you have gained life this turn, Moseo's Infusion ability will trigger twice. This allows you to target and return two different creatures from your graveyard, provided their individual mana values are each less than or equal to the total life you gained this turn.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Moseo, Vein's New Dean
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
If a card in a graveyard has
in its mana cost, X is 0 for the purpose of determining its mana value.No other card is named in this ruling.
- #2· Wizards of the Coast
Moseo's last ability will check as your end step starts to see if you gained life this turn. If you didn't, the ability won't trigger at all. It's not possible to gain life during your end step in time to have the ability trigger.
No other card is named in this ruling.
Popular combos
Real combos played by the community, sorted by popularity.
Nim Deathmantle + Ashnod's Altar + Moseo, Vein's New Dean
- 1Activate Ashnod's Altar by sacrificing Moseo, adding
. - 2When Moseo dies, Nim Deathmantle triggers, causing you to pay
to return Moseo from your graveyard to the battlefield and attach Nim Deathmantle to it. - 3When Moseo enters, it triggers, creating a creature token.
- 4Activate Ashnod's Altar by sacrificing a creature token, adding .
- 5Repeat.
Related cards and tokens
Legal formats
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Meta decks with Moseo, Vein's New Dean
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