Suspicious Bookcase
Artifact Creature — Wall
Defender
, 
: Target creature can't be blocked this turn.
The great library in the Museum of Old Capenna has a million volumes on display—and miles of passages hidden behind them.
Josu Hernaiz
Commander Masters (CMM)
• #977Rulings
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)