Shriekwood Devourer
Creature — Treefolk
Trample
Whenever you attack with one or more creatures, untap up to X lands, where X is the greatest power among those creatures.
With every soul it consumes, its roots stretch farther and reach for more victims.
David Astruga
Rulings
Creatures that enter attacking were never declared as attackers, so Shriekwood Devourer's last ability won't take them into account.
(wotc • 2024-09-20)
The value of X is calculated only once, as Shriekwood Devourer's last ability resolves. This means that the value of X may be different than you had hoped when attackers were declared if attacking creatures have left the battlefield or their power has changed.
(wotc • 2024-09-20)
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Rulings
Creatures that enter attacking were never declared as attackers, so Shriekwood Devourer's last ability won't take them into account.
(wotc • 2024-09-20)
The value of X is calculated only once, as Shriekwood Devourer's last ability resolves. This means that the value of X may be different than you had hoped when attackers were declared if attacking creatures have left the battlefield or their power has changed.
(wotc • 2024-09-20)