Legendary Creature — Human Elf Cleric
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.)
1/3
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→ Infinite turns, Lock
→ Infinite colored mana, Infinite combat phases, Infinite untap of creatures you control
→ Infinite colored mana, Infinite combat phases, Infinite +1/+1 counters on creatures you control
→ Infinite colored mana, Infinite combat phases, Infinite +1/+1 counters on creatures you control
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.
Once a creature becomes monstrous, it can't become monstrous again. If the creature is already monstrous when the monstrosity ability resolves, nothing happens.
The value of X is determined only once, as Maester Seymour's last ability resolves.
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.