While their main focus is on spells, sometimes they can find powerful effects attached to creatures, like Snapcaster Mage
Not only does this provide incidental damage to keep your opponents under direct, consistent pressure, it serves as an outlet for infinite Treasure (or Clue, or Food) to become a win condition
Play a bunch of god creatures, tutor for The World Tree, sacrifice it, and put any number of god cards into play
With Tianas ability, Special Reservation, anytime one of your characters is challenged while Tiana is exerted, the challenging character gets -3 strength unless your opponent pays three ink
Finally, the newest category of the player/collector has arrived
Primal Amulet Four-mana rocks need to offer a substantial reward given how slow they are, which Primal Amulet does