Monolith is great, you often find it with the delving architects in the structure decks. It is a bit slow though, and is not necessary for the matchups which are actually hard imo (war lol). As I have been seeing mostly war at low mythic, I play some wep removal. Iron-tooth is prolly the best fit for removal in these types of decks, but as it is expensive AF, I play 1x svart-basilisk. Wish I had something better, but it is useful against war, zombies, occasionally nature. Not the worst.