Maester Seymour 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
At the beginning of combat on your turn, put a number of +1/+1 counters equal to Maester Seymour's power on another target creature you control.: Monstrosity X, where X is the number of counters among creatures you control. (If this creature isn't monstrous, put X +1/+1 counters on it and it becomes monstrous.)
How it works : Maester Seymour
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
The value of X is determined only once, as Maester Seymour's last ability resolves.
No other card is named in this ruling.
- #2· Wizards of the Coast
Monstrous isn't an ability that a creature has. It's just something true about that creature. If the creature stops being a creature or loses its abilities, it will continue to be monstrous.
No other card is named in this ruling.
- #3· Wizards of the Coast
If Maester Seymour is no longer on the battlefield when its first ability resolves, use its power as it last existed on the battlefield to determine how many +1/+1 counters to put on the target creature.
No other card is named in this ruling.
- #4· Wizards of the Coast
Once a creature becomes monstrous, it can't become monstrous again. If the creature is already monstrous when the monstrosity ability resolves, nothing happens.
No other card is named in this ruling.
Popular combos
Real combos played by the community, sorted by popularity.
Maester Seymour + Sage of Hours
- 1At the beginning of your combat phase, Maester Seymour triggers, putting at least five +1/+1 counters on Sage of Hours.
- 2Activate Sage of Hours by removing all +1/+1 counters from it, causing you to take at least one extra turn after this one.
- 3Repeat each turn.
Maester Seymour + Crystalline Crawler + Aggravated Assault
- 1At the beginning of your combat phase, Maester Seymour triggers, putting at least five +1/+1 counters on Crystalline Crawler.
- 2Move to your postcombat main phase.
- 3Activate Crystalline Crawler's first ability five times by removing five +1/+1 counters from it, adding
.
- 4Activate Aggravated Assault by paying
, untapping all creatures you control and causing you to get an additional combat and main phase after this one.
- 5Repeat.
Maester Seymour + Crystalline Crawler + Hellkite Charger
- 1At the beginning of your combat phase, Maester Seymour triggers, putting at least seven +1/+1 counters on Crystalline Crawler.
- 2Declare Hellkite Charger as an attacker, triggering its ability.
- 3Holding priority, activate Crystalline Crawler's first ability seven times by removing seven +1/+1 counters from it, adding
.
- 4Resolve the Hellkite Charger trigger, causing you to pay
to untap all attacking creatures you control and to get an additional combat phase after this one.
- 5Repeat.
Maester Seymour + Crystalline Crawler + Najeela, the Blade-Blossom
- 1At the beginning of your combat phase, Maester Seymour triggers, putting at least five +1/+1 counters on Crystalline Crawler.
- 2Activate Crystalline Crawler's first ability five times by removing five +1/+1 counters from it, adding
.
- 3Activate Najeela by paying
, untapping all attacking creatures you control and causing you to get an additional combat phase after this one.
- 4Repeat.
Legal formats
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Meta decks with Maester Seymour
No archived Top 8 deck with this card yet.









