Merciless Javelineer

Oracle Text

2, Discard a card: Put a -1/-1 counter on target creature. That creature can't block this turn.

Card Rulings

4/18/2017 Once a creature has blocked, Merciless Javelineer’s ability can’t undo that block.
4/18/2017 The target creature won’t be able to block even if the -1/-1 counter is removed from it or if the -1/-1 counter can’t be put on it.

Additional Information