Hi,

A little ask, can I trigger marcus's hability if I have not any support card in discard pile?

•Marcus Jamburg, Finder of Lost Things
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Type : Character
Cost : 3
Skill : 3
Icons : AAI
Subtype : Independent. Relic Hunter.
Game Text : Toughness +1. Action: Return Marcus Jamburg to your hand to choose and put into play a support card from your discard pile.
Flavor text :
Illustrator : Daniel Rizea
Collector's Info : Words of Power F40

I think, I cann't because: "A player cannot trigger a card effect that requieres him to choose a certain number of targets if there are not enough valid targets available" (from FAQ=

You are correct. The thing you are trying to do is return a Support card from the discard pile, at the cost of returning Jamburg. If you have no Support cards discarded, you can't trigger his ability.