Suspicious Bookcase
Artifact Creature — Wall
Defender
, 
: Target creature can't be blocked this turn.
All the books were dusty with disuse, save the one titled *Camouflage and Its Practical Applications*.
Anastasia Ovchinnikova
Core Set 2019 (M19)
• #246Rulings
Activating Suspicious Bookcase's ability after a creature has become blocked won't cause that creature to become unblocked.
(wotc • 2018-07-13)
Rulings
Activating Suspicious Bookcase's ability after a creature has become blocked won't cause that creature to become unblocked.
(wotc • 2018-07-13)