Giving your dragons ward makes them much harder to deal with, and Riths end step trigger turns excess damage into fresh 4/4 flying Dragon tokens
6 Rockets Hitmonchan (Holofoil) $82.33 Team Rocket Ready To Fight Rocket's Hitmonchan has benefited from steady growth, climbing from about $60 to its current point
Honorable Mentions: Thraben Inspector Toolcraft Exemplar Martyr of Sands Shahrazad Lin Sivvi, Defiant Hero Empyrial Armor Councils Judgment Gideon, Ally of Zendikar Cataclysm Yosei, the Morning Star
11 Strength-Testing Hammer (Galaxy Foil) - $7.66 Speaking of dice rolling, Strength-Testing Hammer buffs the equipped creature by a random amount depending on how generous the luck of the dice is feeling when the equipped creature attacks
They also save you time, as you are able to use them despite not having the cards in your collection, albeit for a limited number of uses