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.
{3}{G}{G}: 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.)
Live market data
$1.46 – $5.71
Nonfoil $1.46 Foil $5.71 Cardmarket €1.24
TCGplayer & Cardmarket market price
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