Once a creature with power 2 or less has been blocked, Sneaking Guide’s ability won’t cause it to become unblocked.
25-09-2020
wotc
If the target creature’s power is greater than 2 as Sneaking Guide’s ability tries to resolve, the ability doesn’t resolve. However, if instead the creature’s power is raised above 2 after the ability resolves, it still can’t be blocked that turn.
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