The Sound of Drums

Goad is normally a control lever: you point an enemy creature at someone else and defang it as a threat to you. Bolt it onto a doubler and the lever inverts. The enchanted creature is compelled to attack, and whatever it hits absorbs twice the damage, so the aura turns an opponent's blocker or beater into a weapon aimed away from you. The forced-attack line is the whole engine: goad pushes the doubling to land somewhere, and it happens to a permanent or player you did not have to convince to swing. The recursion matters just as much. Auras historically punish you for one-for-one removal (kill the creature, lose two cards), but returning this from the graveyard for the same cost as its front side means a chump-blocked or destroyed host is a temporary setback rather than card disadvantage. You re-cast it on the next viable body and the pressure resumes. That combination (a compulsion, a multiplier, and a rebuy) is why it reads more like a political incentive than a combat trick: it does not care which creature it rides, only that something big is being forced to hit something, hard, on a turn that is not yours.