Earthcraft and Magus of the Candelabra are quite full on
First, remember that granting an already-toxic creature toxic 1 from Karumonix means itll give an opponent a number of poison counters equal to its total toxic value, so Blightbelly Rat actually connects for two poison counters with Karumonix on the field
As long as you have the mana pool to make it happen (and the right set of cards to exploit it), you could set it up to possibly cast a creature every turn
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This kind of hand disruption is generally a bit off theme for these kinds of deck, it is not what you are really about so while it is quite good it just isn't that enticing or effective
Once you have a good amount, you can use the alternate commander from the deck, Vihaan, Goldwaker to transform all those Treasures into 3/3 artifact creatures that are also outlaws, giving them all vigilance and haste, both giving your other outlaws a huge boost, and your newly animated Treasure tokens the ability to swing out on the same turn