Accursed Horde

Oracle Text

1B: Target attacking Zombie gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it. If its toughness is 0 or less, it's still put into its owner's graveyard.)

Card Rulings

7/14/2017 Accursed Horde’s ability can target itself while it’s attacking.
7/14/2017 The target Zombie gains indestructible for the rest of the turn, even after it stops being an attacking creature.