(Choose any number of permanents and/or players, then give each another counter of each kind already there.) Illustrated by Nicholas Gregory Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
The only real format the TCG saw this in was post September 2013 Dragon Rulers, which was still Tier 0, so they mostly had the success with the card
As you can see in the pricing chart, every bulk common, uncommon, and basic land you send to Card Conduit will actually reduce the total value of your order (you're paying $0.03 to send it in and getting backat best$0.005), while bulk rares, foil commons, and foil uncommons break even (you pay $0.03 and get back $0.03)
If this card is in your GY (except the turn it was sent there), while you control a Level 8 Beast monster
Banlist History Restriction changes recorded for Dark Beckoning Beast
The flexibility here is key since is required for most of the other cards ranked