Dominaria United

Automatic Librarian | Artifact Creature | Construct | When Automatic Librarian enters the battlefield, scry 2. (Look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.) | Alex Konstad

Salvaged Manaworker | Artifact Creature | Construct | {1}: Add one mana of any color. Activate only once each turn. | Julian Kok Joon Wen

Shield-Wall Sentinel | Artifact Creature | Golem | Defender When Shield-Wall Sentinel enters the battlefield, you may search your library for a creature card with defender, reveal it, put it into your hand, then shuffle. | Titus Lunter

Walking Bulwark | Artifact Creature | Golem | Defender {2}: Until end of turn, target creature with defender gains haste, can attack as though it didn't have defender, and assigns combat damage equal to its toughness rather than its power. Activate only as a sorcery. | Jonas De Ro