Jumbo Cactuar Basically a 'win the game' card Deals 10K damage Pair with indestructible/hexproof Jumbo Cactuars 10,000 Needles ability is not only a total flavor win but is also one of the wildest pieces of rules text Ive ever seen on a Magic card
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You can run a Robe of Stars and Brotherhood Regalia if you want to spend the money, but Thran Power Suit, Wrecking Ball Arm, Psychic Paper, Greatsword of Tyr, Short Bow, Heros Heirloom and Web-Shooters are great choices and not very much money
When you add in time for rolling and wacky effects, Planechase Commander games can take a while, too, so you should probably expect to settle in for a little longer than normal, though some of the new planes really encourage attacking and moving the game along, so maybe less than you might think if you're used to Planechase Commander already
While Prosper and Rocco benefit from Junk, it doesnt seem that any commander benefits from exile play in this set