1) Changed the keyword:

"This card can't be the target of Aura spells."

to this new updated form:

"CARDNAME can't be the target of Aura spells."

2) I updated these cards.txt card entries and moved them to the top of file:

Bartel Runeaxe
Tetsuo Umezawa

res/cards.txt

@@ -1,3 +1,18 @@
+Bartel Runeaxe
+3 G R B
+Legendary Creature Giant Warrior
+no text
+6/5
+Vigilance
+CARDNAME can't be the target of Aura spells.
+
+Tetsuo Umezawa
+R B U
+Legendary Creature Human Archer
+no text
+3/3
+CARDNAME can't be the target of Aura spells.
+
 Khalni Hydra
 G G G G G G G G
 Creature Hydra
@@ -8612,21 +8627,6 @@ Legendary Creature Human Warrior
 When Stangg enters the battlefield, if Stangg is on the battlefield, put a legendary 3/4 red and green Human Warrior creature token named Stangg Twin onto the battlefield. When Stangg leaves the battlefield, exile that token. When that token leaves the battlefield, sacrifice Stangg.
 3/4
 
-Bartel Runeaxe
-3 G R B
-Legendary Creature Giant Warrior
-no text
-6/5
-Vigilance
-This card can't be the target of Aura spells.
-
-Tetsuo Umezawa
-R B U
-Legendary Creature Human Archer
-no text
-3/3
-This card can't be the target of Aura spells.
-
 Ayumi, the Last Visitor
 3 G G
 Legendary Creature Spirit

src/forge/CardFactoryUtil.java

@@ -2868,7 +2868,7 @@ public class CardFactoryUtil {
                     if(!spell.getController().equals(target.getController())) return false;
                 }
                 
-                if(kw.equals("This card can't be the target of Aura spells.")) {
+                if(kw.equals("CARDNAME can't be the target of Aura spells.")) {
                     if(spell.isAura()) return false;
                 }