Why does this ability trigger twice?

[DarkusChi]

Hi, anyone know why the triggered ability triggers twice upon 1st activation:

Code: Select all

   <ACTIVATED_ABILITY tag="xxx" forced_skip="1" layer="0">
       
      <COST type="Mana" cost="{1}" />
         
      <EFFECT>
         Object():Register_Set( 0, 12 )
         Object():Register_Set( 1 , 2 )
         
      </EFFECT>        
      
   </ACTIVATED_ABILITY>
   
   
   <TRIGGERED_ABILITY auto_skip="1" layer="7c" >

      <TRIGGER value="ABILITY_RESOLVED">
        return SelfTriggered() and Object():Register_Get( 1 ) == 2
      </TRIGGER>

      <EFFECT>
      Object():Register_Set( 1, 0 )
      AddPowerAndToughnessToSelf( Object():Register_Get( 0 ), 0 )
     </EFFECT>
      
   <DURATION>
        return UntilEndOfTurn()
    </DURATION>
      
   </TRIGGERED_ABILITY>

i.e if i have 3 untapped mana first activation will add 24 to power and not 12, 2nd activation will add 12, 3rd will add 12 and so on. next turn is the same 24,12,12.

[Shatterhouse]

It must be a timing issue with the game sending out an ABILITY_RESOLVED trigger. I wouldn't expect it to happen between abilities, but this one is setting a register to try to control its own trigger, and that probably screws it up.

Try moving Object():Register_Set( 1, 0 ) into a PRE_EFFECT block.

Or this could be a job for the pre_trigger="1" flag.

[DarkusChi]

Thanks Shatterhouse, moving the Object():Register_Set( 1, 0 ) to a pre effect block did the trick