Eye of Nidhogg

Most auras that transform a creature do it to reward the caster; this one is a weapon you point at somebody else. Slap it on an opponent's blocker and you have not helped them: you have converted their creature into a 4/2 flier that must attack, and must attack somebody who is not you. The base power/toughness override is the clever part. It ignores whatever the enchanted creature was, so a durdling 0/4 wall becomes an attacker with flying and deathtouch that its own controller now has to feed into a hostile board. Goad turns their permanent into a liability; the stat rewrite turns it into a genuine threat aimed at whoever they least want to provoke. The recursion clause keeps the aura from being a one-time investment: kill the creature it enchants, or watch it die in the attack you forced, and the Eye comes back to hand to be repointed next turn. That closes the usual loophole with removal-as-answer for goad effects, where trading your own creature to shed the enchantment simply hands the aura back for reuse. It is a piece of political engineering: a single black card that manufactures aggression between two other players and refuses to stay dead while it does it.