If you goaded your opponent's creatures, those creatures must attack a player other than you if they can
It is quite an odd one as planeswalkers in general are far better in cube yet Jace isn't anywhere near as far ahead of the pack, they all get better but for some reason Jace does not, or at least not by the same proportion
In fact, the average price of a Standard deck broke $500 only for a handful of days between Return to Ravnica and Battle for Zendikar
It was a flier that could block the also formerly powerful Serra Angel, and it could increase its own power
Its not really built for it, but you can engage in it and it still has an interesting subgame for it. Sometimes the designers take existing mechanics like Unearth, which allows a player to replay a creature from their graveyard for one final attack, and tweak them to be better in multiplayer