+2 During target opponent's next turn, creatures that player controls attack Gideon the Just if able.
[−2] Return target tapped creature to its owner's hand
0 Until end of turn, Gideon Jura becomes an X/X Elemental creature that's still a planeswalker where X is the number of cards in your hand. Prevent all damage that would be dealt to him this turn.
See Challenge # 138, based mostly on Gideon Jura