Balance your delve usage to avoid depleting your graveyard too quickly, paving the way for a mighty surge when the time is right
Sporeweb Weaver
Then these surveil 1 on arrival to the battlefield, so they can give you card draw security, and then also send it to the graveyard if you don't immediately need it, or just want reanimation, flashback or delirium for later use
Weve seen this effect plenty of times before, on the likes of Deadly Dispute and Costly Plunder
Mercy Killing looks soo good on paper, but in practice it is a dead card against non-creature decks
Each time you trigger a Venture Into the Dungeon ability on a permanent or spell, you may choose to either begin a dungeon you haven't already started, or progress through a dungeon you have