are proxy cards legal mtg Commander like Mishra's Workshop accepted? My new favorite proxy card

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

Pair that up with the card Dark Ritual, which adds three black mana to your mana pool for just one mana, and you can drop the Specter on your first turn

But seriously, I do get why they didnt want to ban Sol Ring out of the format

I would like to see more designs like this

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

It's a one mana red burn spell, designed to be weaker than Lighting Bolt, and is strictly worse than a whole bunch of comparable cards