They're intended to make playing with the new cards more fun by clearing up the common misconceptions and confusion inevitably caused by new mechanics and interactions
This is the same sort of thing as Brine Elemental and Vesuvan Shapeshifter in that is is the interaction of two expensive creatures making a combo
However, Myrkul does more work than that, fundamentally changing how some cards were meant to be played
This card prevents flooding in two ways: It both surveils and gives you something to do with excess mana later
If this face-up card in its owner's control leaves the field because of an opponent's card effect: You can Special Summon 2 "Krawler" monsters with different names from your Deck in face-down Defense Position, except "Krawler Dendrite"
Included Cards: 50 random Pokmon single cards (variety of types, generations, and rarities) 5 rare cards (random mix of V, EX, VMAX, VSTAR, Full Art, Shiny or Radiant cards)