The cards should be of varying mana values and incorporate progressive mechanics
From scrying to gaining life to drawing cards to making Goblin tokens, there is a deep power to the dungeon crawling game
10 months ago Oriq Loremage, Buried Alive and Entomb all seem like would be perfect in here but not even seeing them on your maybe list
10) Provoke ( Legions ) I think this mechanic has what it takes to show up more frequently than a block mechanic
10 Dalek Drone Dalek Drone is one of the best creatures that destroy a creature when it enters the battlefield
The Cid, Timeless Artificer cards are 4/4 creatures that cost four mana (one blue, one white, and two of any color), with Cycling, letting the player spend a white and a blue mana to discard the card to draw a card