We also have a full list of the promo cards here, a searchable card database here, and a simple Lorcana card list too
You'll be able to use this on turn two most times, and almost any time you have a target in your graveyard worth recurring, you'll have the mana you need to get it
Mind Grind costs X and one Blue and one Black, and it reads, Each opponent reveals cards from the top of their library until they reveal X land cards, then puts all cards revealed this way into their graveyard
Too long the format was about fast non-interactive decks like Eldrazi, Phoenix or Hogaak
16 Toxrill, The Corrosive A Serious Threat With Little Escape Printed in Innistrad: Crimson Vow alongside Umbris, while Toxrill, the Corrosive may cost a hefty seven mana, once cast it is capable of single-handedly taking over a Commander game