* The effect that destroys 1 of your opponent’s cards targets that card.<ref name="Konami-SDMM"/>
* You can discard “[[Machina Fortress]]” itself as part of the [[cost]] to Special Summon it.<ref name="Konami-SDMM"/>
* [[Discard]]ing Machine-Type monsters is a cost to Special Summon this card.<ref name="Konami-SDMM"/>
* You cannot discard “[[Machina Fortress]]” itself as part of the [[cost]] to Special Summon it. You must declare where you are Summoning it from before you pay the cost and it must remain in that location both before and after the cost is paid. If you declare that you are Summoning it from your grave, and it is in your hand as you declare this, the Summon cannot be conducted. Conversely, if you declare you are summoning it from your hand and it is discarded to the grave as part of the cost, then it is also no longer in the declared location and likewise, the Summon cannot be conducted. <ref name="Konami-SDMM"/>
* Your opponent will miss the timing to activate the effect of “[[Archfiend of Gilfer]]” if it is discarded by the effect of “[[Machina Fortress]].”<ref name="Konami-SDMM"/>