Dominaria United

Micromancer | Creature | Human Wizard | When Micromancer enters the battlefield, you may search your library for an instant or sorcery card with mana value 1, reveal it, put it into your hand, then shuffle. | Ernanda Souza

Monstrous War-Leech | Creature | Leech Horror | Kicker {U} (You may pay an additional {U} as you cast this spell.) As Monstrous War-Leech enters the battlefield, if it was kicked, mill four cards. (To mill a card, put the top card of your library into your graveyard.) Monstrous War-Leech's power and toughness are each equal to the highest mana value among cards in your graveyard. | Christopher Burdett

Rona, Sheoldred's Faithful | Legendary Creature | Human Wizard | Whenever you cast an instant or sorcery spell, each opponent loses 1 life. You may cast Rona, Sheoldred's Faithful from your graveyard by discarding two cards in addition to paying its other costs. | Ryan Alexander Lee

Nael, Avizoa Aeronaut | Legendary Creature | Elf Scout | Flying Domain — Whenever Nael, Avizoa Aeronaut deals combat damage to a player, look at the top X cards of your library, where X is the number of basic land types among lands you control. Put up to one of them on top of your library and the rest on the bottom in a random order. Then if there are five basic land types among lands you control, draw a card. | Miguel Mercado