Core Set 2021

Battle-Rattle Shaman | Creature | Goblin Shaman | At the beginning of combat on your turn, you may have target creature get +2/+0 until end of turn. | Warren Mahy

Bolt Hound | Creature | Elemental Dog | Haste (This creature can attack and {T} as soon as it comes under your control.) Whenever Bolt Hound attacks, other creatures you control get +1/+0 until end of turn. | Forrest Imel

Chandra's Pyreling | Creature | Elemental Lizard | Whenever a source you control deals noncombat damage to an opponent, Chandra's Pyreling gets +1/+0 and gains double strike until end of turn. (It deals both first-strike and regular combat damage.) | Josu Hernaiz

Havoc Jester | Creature | Devil | Whenever you sacrifice a permanent, Havoc Jester deals 1 damage to any target. | Jason A. Engle

Heartfire Immolator | Creature | Human Wizard | Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.) {R}, Sacrifice Heartfire Immolator: It deals damage equal to its power to target creature or planeswalker. | Donato Giancola

Hellkite Punisher | Creature | Dragon | Flying {R}: Hellkite Punisher gets +1/+0 until end of turn. | Andrey Kuzinskiy

Kinetic Augur | Creature | Human Shaman | Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.) Kinetic Augur's power is equal to the number of instant and sorcery cards in your graveyard. When Kinetic Augur enters the battlefield, discard up to two cards, then draw that many cards. | Colin Boyer

Alpine Houndmaster | Creature | Human Warrior | When Alpine Houndmaster enters the battlefield, you may search your library for a card named Alpine Watchdog and/or a card named Igneous Cur, reveal them, put them into your hand, then shuffle. Whenever Alpine Houndmaster attacks, it gets +X/+0 until end of turn, where X is the number of other attacking creatures. | Mark Behm

Dire Fleet Warmonger | Creature | Orc Pirate | At the beginning of combat on your turn, you may sacrifice another creature. If you do, Dire Fleet Warmonger gets +2/+2 and gains trample until end of turn. (It can deal excess combat damage to the player or planeswalker it's attacking.) | Mathias Kollros

Leafkin Avenger | Creature | Elemental Druid | {T}: Add {G} for each creature with power 4 or greater you control. {7}{R}: Leafkin Avenger deals damage equal to its power to target player or planeswalker. | Filip Burburan