are proxy cards legal mtg Commander like Mishra's Workshop accepted? Proxy card - MTG Wiki

For Best of One, definitely no but that's because WotC seems to have no intention of making Bo1 a thing on paper, so even though you could technically play it on tabletop, for better or worse, I doubt we ever will

Accessories10 double-sided tokens, life tracker, deck box, and 1 foil-etched Display Commander

I think that the discard and deal three options are the most powerful of the six, while the remaining of the four are the flex choices depending on the situation

Instant Color tag templates(None) Plumb the Forbidden As an additional cost to cast this spell, you may sacrifice one or more creatures

Tapping it lets you cast as many creaures using forage as you want

I would like to see more designs like this