Pretty sure thats the name of the card.
I play a Toggwaggle+Hakkar OTK in wild.
Blood of hakkar says when its drawn you shuffle two more copies into your deck…
3+ games or so ive witnessed this reshuffle not get processed and the cards simply vanish instead leaving them with just plain old fatigue after ive swapped them with a deck with nothing but a couple of these bloods. Pretty annoying.
Do you have screenshots, video or deck tracker replays?
How full were the opponent’s hands? If they have 10 cards in hand then any card (even if it does not actually go into the hand) is overdrawn (destroyed) and does not activate.
You should be seeing this in the battle log (history tiles) on the left side of the screen.