Throne of Eldraine

Mantle of Tides | Artifact | Equipment | Equipped creature gets +1/+2. Whenever you draw your second card each turn, attach Mantle of Tides to target creature you control. Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery.) | Lie Setiawan

Merfolk Secretkeeper | Creature | Merfolk Wizard | | Jana Schirmer

Opt | Instant | | Scry 1. Draw a card. | Dan Scott

Overwhelmed Apprentice | Creature | Human Wizard | When Overwhelmed Apprentice enters the battlefield, each opponent mills two cards. Then you 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.) | Jason Rainville

So Tiny | Enchantment | Aura | Flash Enchant creature Enchanted creature gets -2/-0. It gets -6/-0 instead as long as its controller has seven or more cards in their graveyard. | Randy Vargas

Witching Well | Artifact | | When Witching Well 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.) {3}{U}, Sacrifice Witching Well: Draw two cards. | John Avon