Dominaria

Excavation Elephant | Creature | Elephant | Kicker {1}{W} (You may pay an additional {1}{W} as you cast this spell.) When Excavation Elephant enters the battlefield, if it was kicked, return target artifact card from your graveyard to your hand. | Viktor Titov

Academy Journeymage | Creature | Human Wizard | This spell costs {1} less to cast if you control a Wizard. When Academy Journeymage enters the battlefield, return target creature an opponent controls to its owner's hand. | Magali Villeneuve

Cloudreader Sphinx | Creature | Sphinx | Flying When Cloudreader Sphinx 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.) | Kev Walker

Windgrace Acolyte | Creature | Cat Warrior | Flying When Windgrace Acolyte enters the battlefield, mill three cards and you gain 3 life. | Bayard Wu

Fire Elemental | Creature | Elemental | | Joe Slucher

Mammoth Spider | Creature | Spider | Reach (This creature can block creatures with flying.) | Lars Grant-West

Guardians of Koilos | Artifact Creature | Construct | When Guardians of Koilos enters the battlefield, you may return another target historic permanent you control to its owner's hand. (Artifacts, legendaries, and Sagas are historic.) | Yeong-Hao Han