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{U}, {T}: Until your next turn, target creature an opponent controls can't be blocked. Goad that creature. (Until your next turn, that creature attacks each combat if able and attacks a player other than you if able.)
Attacking with a goaded creature doesn't cause it to stop being goaded.
Being goaded more than once by the same player is redundant.
If a creature you control has been goaded by multiple opponents, it must attack one of your opponents who hasn't goaded it. If a creature you control has been goaded by each of your opponents, you choose which opponent it attacks.
If a goaded creature can't attack for any reason (such as being tapped or having come under that player's control that turn), then it doesn't attack. If there's a cost associated with having it attack, its controller isn't forced to pay that cost, so it doesn't have to attack in that case either.
If a goaded creature doesn't meet any of the above exceptions and can attack, it must attack a player other than a player who goaded it if able. It the creature can't attack any of those players but could otherwise attack, it must attack an opposing planeswalker (controlled by any opponent) or a player who goaded it.
If you goad a creature you control, it must attack, and it must attack a player rather than a planeswalker.
If you leave the game, any creatures you've goaded remain goaded until your next turn would have begun. They don't immediately stop being goaded and don't remain goaded indefinitely.
Once a creature an opponent controls has been legally blocked, activating Sly Instigator's ability won't change or undo that block.
