Sly Instigator

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.

If, during a player's declare attackers step, a creature that player controls that's been goaded is tapped, is affected by a spell or ability that says it can't attack, or hasn't been under that player's control continuously since the turn began (and doesn't have haste), then it doesn't attack. If there's a cost associated with having a creature attack a player, its controller isn't forced to pay that cost, so it doesn't have to attack that player.