Of course, you'll want some haste enablers in play to do essentially make Old Gnawbone free, but the creatures you already have in play can generate Treasure as well
For example, if you play a Mountain and your chosen number is 2084750930, you'd only be able to cross out one of those zeroes
Some were originally shown as P1 in promotional images, but the Challenge promo cards from Season 1 used the C1 set label
Captain Hook Forceful Duelist The wording on this card changed from Challenger +2 (When challenging, this character gets + 2 Strength) to Challenger +2 (While challenging, this character gets + 2 Strength)
In: Chrome Mox My final artifact addition was one I kicked myself for not running as soon as I got it
These tips on deckbuilding are guidelines, not set-in-stone rules