Hadoken, as a functional reskin of Lightning Bolt, is legal in the formats where that card is legal: Modern, Legacy, Vintage, Commander, Oathbreaker, and Pauper
These are all definitely worth opening from a booster pack now and throughout the set's time in Standard
Of course, the "artifact creatures you control have menace" is a cherry on top for a deck that churns out giant artifact creatures every turn
Im pretty sure that if you drop an ink drop on a piece of paper, let it dry a bit (but not completely!) and then fold the paper without pressing too hard, it will give a grey stamp of the original stamp and a very feint back imprinted stamp on the other part
3 Nefarious - Mythic Theme Its Me, Ya Boi This demonic Jumpstart Theme gives you access to one of the most powerful Demons ever to defile Magic, Vilis, Broker of Blood
If you end up pulling this, make sure to sleeve it and take good care of it