Atletico have had great strikers who have left for large sums off money

Vieri, Hasselbaink, Forlan, Aguero, Falcao, Torres, and now Costa

But is Costa was to leave, who would fill his spot?

Could it even be Villa?

I heard that they are linked with Giroud and SerieA's Immobile. But I think they need a killer up front, like they always did in the past with all those names you listed, and Villa is now past his time. Jackson Martinez?

They are linked with a ton of strikers. I guess if that Chelsea land him Atletico will want Torres as part of the deal.

Immobile will do well there

I heard Atletico could target Javier Hernandez(Chicharito).