You can discard Effect Veiler to negate the effects of a monster on the field until the end of the turn
Unlike Gale Dogra, it can be used as long as LP exists
If you want to give a blocking creature -1/-1 in black, you could run Plague Wight or Cadaverous Knight instead
We went around, in order of our assigned numbers and each grabbed one item until everything was gone, with the exception of some Sword and Shield Pokmon packs and Shining Fates trainer boxes, which I learned didnt command a premium of any sort on the secondary market
But, as with any complex business system, I quickly found out that my primitive method for tracking inventory, and their ensuing sale, grossly fell short of the level of organization needed to flip dozens or even hundreds of cards often duplicates at the same time