Additionally, whenever Umbris or another nightmare or horror enters the battlefield under its owner's control, target opponent exiles cards from the top of their library until they exile a land
Of course, Johnny likes toolboxes, so its an interesting addition to their arsenal
But I could still see this card showing up in a competitive Standard deck, which puts it in the B-tier
That means playing cards like Doomed Dissenter over Raise the Alarm or Butcher Ghoul, Ministrant of Obligation over Weaponcraft Enthusiast etc
If it had any other artifact subtypes (such as Equipment), it will retain those
Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Not Legal Toolbox Buy This Card Notes and Rules Information for Krosan Grip: Players still get priority while a card with split second is on the stack