cards that prevent sacrifice mtg Martyr's Cause You have shroud Cards that counter forced sacrifice

Whenever Umbris, or another Nightmare or Horror, comes into play under your control, you can take a chunk out of an opponents deck, with every card exiled feeding back into Umbris stats

Once the cards are riffled, bend them up towards you, in the opposite direction that they were bent before

Besides, there were plenty of occasions where untapping a Mountain for his +1 was all the mana you needed, enabling a Galvanic Blast to keep Koth safe and well on his way to ultimating

It is hard to say how much the Threshold effect will matter

Its also great against creature strategies that go wide like tokens or elves that can be very difficult to deal with