Wilds of Eldraine

Belligerent of the Ball | Creature | Ogre Warrior | Celebration — At the beginning of combat on your turn, if two or more nonland permanents entered the battlefield under your control this turn, target creature you control gets +1/+0 and gains menace until end of turn. (It can't be blocked except by two or more creatures.) | Pascal Quidault

Boundary Lands Ranger | Creature | Human Ranger | At the beginning of combat on your turn, if you control a creature with power 4 or greater, you may discard a card. If you do, draw a card. | Pascal Quidault

Embereth Veteran | Creature | Human Knight | {1}, Sacrifice Embereth Veteran: Create a Young Hero Role token attached to another target creature. (If you control another Role on it, put that one into the graveyard. Enchanted creature has "Whenever this creature attacks, if its toughness is 3 or less, put a +1/+1 counter on it.") | Andreia Ugrai

Hearth Elemental | Creature | Elemental | This spell costs {X} less to cast, where X is the number of cards in your graveyard that are instant cards, sorcery cards, and/or have an Adventure. | Nicholas Gregory

Tattered Ratter | Creature | Human Peasant | Whenever a Rat you control becomes blocked, it gets +2/+0 until end of turn. | Tyler Walpole

Two-Headed Hunter | Creature | Giant | Menace (This creature can't be blocked except by two or more creatures.) | Filip Burburan

Imodane's Recruiter | Creature | Human Knight | When Imodane's Recruiter enters the battlefield, creatures you control get +1/+0 and gain haste until end of turn. | Nestor Ossandon Leal

Picnic Ruiner | Creature | Goblin Rogue | Whenever Picnic Ruiner attacks while you control a creature with power 4 or greater, Picnic Ruiner gains double strike until end of turn. | Edgar Sánchez Hidalgo

Ash, Party Crasher | Legendary Creature | Human Peasant | Haste Celebration — Whenever Ash, Party Crasher attacks, if two or more nonland permanents entered the battlefield under your control this turn, put a +1/+1 counter on Ash. | Jason Rainville

Johann, Apprentice Sorcerer | Legendary Creature | Human Wizard | You may look at the top card of your library any time. Once each turn, you may cast an instant or sorcery spell from the top of your library. (You still pay its costs. Timing rules still apply.) | Dmitry Burmak

Totentanz, Swarm Piper | Legendary Creature | Human Warlock Bard | Whenever Totentanz, Swarm Piper or another nontoken creature you control dies, create a 1/1 black Rat creature token with "This creature can't block." {1}{B}: Target attacking Rat you control gains deathtouch until end of turn. | Matt Stewart

Ruby, Daring Tracker | Legendary Creature | Human Scout | Haste Whenever Ruby, Daring Tracker attacks while you control a creature with power 4 or greater, Ruby gets +2/+2 until end of turn. {T}: Add {R} or {G}. | Ekaterina Burmak