Aquatic Incursion

Oracle Text

When Aquatic Incursion enters the battlefield, create two 1/1 blue Merfolk creature tokens with hexproof. (They can't be the targets of spells or abilities your opponents control.)

3U: Target Merfolk can't be blocked this turn.

Card Rulings

1/19/2018 Activating the last ability of Aquatic Incursion after a Merfolk has become blocked won’t cause it to become unblocked.