Laurent - Added a few cards to DIS,small correction on ZEN, ONS, addition/removal in ICE

DIS additions:cards with Hellbent and some cards with @damaged. Note that "opponent" is not a valid target and "player|opponentinplay" will not work. So for some addition we assume that the creature will never deal damage to its owner (e.g trygon in DIS). Hellbent works fine in the situation described.

projects/mtg/bin/Res/sets/ONS/_cards.dat

@@ -216,7 +216,6 @@ text={B}, {T}, Sacrifice Doomed Necromancer: Return target creature card from yo
 auto={B}{T}{S}:moveTo(myBattlefield) target(creature|mygraveyard)
 id=39549
 name=Doomed Necromancer
-rarity=R
 mana={2}{B}
 type=Creature
 subtype=Human Cleric Mercenary
@@ -1038,7 +1037,6 @@ id=43736
 name=Threaten
 target=creature
 alias=129767
-target=creature
 auto=haste
 auto=untap
 mana={2}{R}
@@ -1048,7 +1046,6 @@ type=Sorcery
 [card]
 text=Thunder of Hooves deals X damage to each creature without flying and each player, where X is the number of Beasts on the Battlefield.
 auto=foreach(beast) damage:1 all(player,creature[-flying])
-
 id=39847
 name=Thunder of Hooves
 rarity=U