Hi, please vote if you want a feature from subject.
Background:
Current attachment process of trello card to a main trello card is uncomfortable: list also shows already archived cards and it is not cool to search what you want from a big plain list of cards.
Proposal:
If I could drag a trello card to a trello card to link it - that would be much more comfortable.
Also linking one card to another should appear on both sides like in confluence.