Forum:Lava Golem and Macro Cosmos

Hello there, I have two questions that've been bugging me for quite some time now. Lava Golem says: "This card can only be Special Summoned to your opponent's side of the field by Tributing 2 monsters they control." Is tributing two monsters your opponent controlls a cost or an effect? I think it's a cost but since I'm not sure I'd like to have an official answer. I also have a question about Macro Cosmos. It says "You can Special Summon 1 "Helios - The Primordial Sun" from your hand or Deck when you activate this card." Could this effect possibly miss the timing? It is a "you can...when"-condition instead of a "when...you can"-condition so I'm not sure what to think exactly. Thanks in advance. Poseidome (talk • contribs) 15:56, August 4, 2010 (UTC)