Collectible Card Game Headquarters

I was trying to code Frontline Medic, happy to see that there's a constant called COLOUR_X. I thought it was a "virtual" color given to cards that have in their mana costs. So I made this target definition:

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    <TARGET_DEFINITION id="0">
    local filter = Object():GetFilter()
    filter:Clear()
    filter:SetZone( ZONE_STACK )
    filter:SetStackObjectType( STACK_OBJECT_CARD )
    filter:AddColour( COLOUR_X )
    filter:SetHint( HINT_ENEMY_ONLY, EffectController() )
    </TARGET_DEFINITION>

...and tested it against the AI casting Green Sun's Zenith, but no way, I couldn't activate the ability.

Am I missing something, or COLOUR_X doesn't work at all?

Just in case someone has the same big idea as I had, the following code doesn't work either:

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    <TARGET_DEFINITION id="0">
    MTG():ClearFilterMarkedObjectsInZone( ZONE_STACK )
    local filter = Object():GetFilter()
    filter:Clear()
    filter:SetZone( ZONE_STACK )
    filter:SetStackObjectType( STACK_OBJECT_CARD )
    local filter_count = filter:EvaluateObjects()
    for i=0,filter_count-1 do
        local candidate = filter:GetNthEvaluatedObject(i)
       local chest = candidate:GetDataChest()
        if chest ~= nil and chest:Get_Int( COMPARTMENT_ID_X ) &gt; 0 then
           candidate:MarkForFilter()
        end
    end
    filter:SetMarkedObjectsOnly()
    filter:SetHint( HINT_ENEMY_ONLY, EffectController() )
    </TARGET_DEFINITION>

Apart from being sub-optimal if it worked (it would allow to counter only spells where is greater than 0, but I could live with it), it doesn't work at all, and if I remember well it's not the first time that I try to mark objects on the stack: I think it's something that the game can't do, no matter what.

It would not surprise me if COLOUR_X does not work at all, much like COLOUR_COLOURLESS doesn't work and we have to test for each colour to make sure a card is or is not colourless.