Mystery Booster: Commander Edition

Whenever an artifact is put into a graveyard from the battlefield, put a number of +1/+1 counters equal to that artifact's mana value on Joven and Chandler. RRR, T: Gain control of target artifact until end of turn. Untap it. It gains haste until end of turn.

Rulebreaker — A deck with this commander can have instant and sorcery cards of one additional color not in this commander's color identity and any basic land cards. Whenever you cast an instant or sorcery spell, create a 1/1 blue and red Otter creature token with prowess. (Whenever you cast a noncreature spell, it gets +1/+1 until end of turn.)