Hello. I'm new to the game and unsure about the rules. I just realised that Elrond can summon any ally regardless of sphere, which got me thinking… Attachments and events etc with 0 resource requirement to summon - do they even require a hero to be summoned?

For example - I have a [spirit] attachment card in my deck, but only [Leadership] and [Lore] heroes. The cost to summon the attachment is 0, so I don't have to use resources from a [spirit] hero pool. Do I still need a [spirit] hero in play? Thanks.

Olorin93 said:

They just mean you might end up holding a card that you can't legally play. Like what happens to me every time I get forced to discard my only copy of Song of Battle in my tri-color deck with Tactics splash.

As for paying for 0-cost cards, that's covered in the game manual: pg. 12: "Cards with a cost of zero do not require a resource to be spent in order to pay their cost, but they do require at least one hero under that player’s control to have a resource icon that matches the card’s sphere."

Yeah, I mean pay not summon. Cool, now I understand how it works. Thanks.