Klement, Knowledge Acolyte

Vigilance
When this creature specializes, seek three nonland permanent cards. Choose one of those cards and shuffle the rest into your library.

Drider

Reach
Whenever Drider deals combat damage to a player, create a 2/1 black Spider creature token with menace and reach.

Ravenloft Adventurer

When Ravenloft Adventurer enters the battlefield, you take the initiative.
If a creature an opponent controls would die, instead exile it and put a hit counter on it.
Whenever Ravenloft Adventurer attacks, if you’ve completed a dungeon, defending player loses 1 life for each card they own in exile with a hit counter on it.

Cut a Deal

Each opponent draws a card, then you draw a card for each opponent who drew a card this way.

Marshland Bloodcaster

Flying
, : Rather than pay the mana cost of the next spell you cast this turn, you may pay life equal to that spell’s mana value.