Adelaide have secured the No.4 selection as clubs continue their negotiations a week out from the AFL national draft.
The day after Port Adelaide and Brisbane swapped first-round selections, the Crows engineered a draft with GWS.
The Giants will drop two spots to No.6 in next Wednesday night's draft, but secure Adelaide's round-one selection in 2020 as part of the deal.
GWS hope to secure Academy prospect Tom Green, while the trade might help the Crows to recruit highly rated teenager Dylan Stephens from SANFL club Norwood.
The Giants said Tuesday's swap followed talks with clubs last month during the trade period.
"Moving up to pick four gives us plenty of options as we head into next week's draft," said Giants list manager Jason McCartney.
"It gives us the opportunity to pick up a high-quality player but it also puts us in a strong position when it comes to our considerations around potential Academy bids."
Likewise, gaining the extra round-one pick next year suits the Crows as they rebuild their list.
"We saw the opportunity to maintain a top-six pick in a fairly even draft, while accumulating more stock in the future, as a massive positive for the club," said Adelaide list boss Justin Reid.
"Our strategy is focused on rejuvenating our playing list through the draft and having the ability to secure more elite talent next year with an additional first-round pick an exciting one."
On Monday, Port gained an extra first-round selection in this year's draft in a deal with Brisbane, who gained a future first-round selection from the Power.
Australian Associated Press