Stand and Fight
Action: Choose an ally with a printed cost of X in any player's discard pile. Put that ally into play under your control. (The chosen ally can belong to any sphere of influence.)
Core Set #51. Spirit.
Stand and fight breaks the game. In a good way. Any ally that died or got discarded is now basically still in your hand. Not to mention the fact that you can discard an off-sphere ally like Beorn and slam him into play. Plus, it's got cool art.