I get that these matchups arent great for you, but I simply dont think Thought-Knot Seer is the answer and would much rather have the extra sideboard space and understand that I need to just mulligan aggressively to hands that can either present fast hate-cards or turn three Karns
In Magic the Gathering's Innistrad: Crimson Vow, we get an up close look at the numerous vampire families that call the plane home
It also has Tyrannical Hole (requiring three Dark Energy cards and two other Energy cards) that deals 180 damage, and Glutton GX (requiring five Dark Energy cards), that deals 100 damage and, if that knocks out your opponents Pokmon, you can take two more Prize cards.
It lets you cast one of them for free if youre the Monarch, which is solid
What about the massacre-style effect of Ascendant Evincar but done differently, taking on his devouring the life essence of those around him for more power to kill opposing creatures