The creature token option works well with ways to replenish Marath's counter, like Cathars' CrusadeCathars' Crusade, and a way to recoup the mana, like Ashnod's AltarAshnod's Altar or Mana EchoesMana Echoes
Sharpie things up, make cool-looking (but clearly not real) proxies for your cube or Commander deckthat's not a problem
Sideboard Breakdown Sweeper Suite: We run three copies of Extinction Event and one copy of Culling Ritual to deal with decks like Ensoul or Convoke
It may not be a simple case of summon and challenge, but rather collect, summon, buff, challenge, and recover
If so, what case would you end up buying
You can also use cards like Arashin SovereignArashin Sovereign to achieve a similar effect to the shuffle card