mtg cards like drannith magistrate mtg-singles-tle-drannithmagistrate-2 – Axion Now Our sanctuaries must be beacons of reason and calm or else they will fall. Drannith Magistrate Extended Foil Ikoria

Keep in mind the balance between creatures and spells

Mono-Red decks can easily cast it for its regular cost as well, as they'll always have access to Red mana

Dark Confidant is a two-mana black creature that reads: At the beginning of your upkeep, reveal the top card of your library and put that card into your hand

Because the Valesk's toughness is only 2, and the Mauler has trample, which means 2 of its 4 damage gets dealt to the Valesk, and 2 gets dealt to the opponent

Id also like to mention that there are no official rules for this mechanic, and Id be surprised to ever see any for these digital-only mechanics

Dig Through Time Another Delve card, Dig Through Time is essentially a better Treasure Cruise for a slightly higher cost