Ikoria: Lair of Behemoths

Majestic Auricorn | Creature | Unicorn | Mutate {3}{W} (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.) Vigilance Whenever this creature mutates, you gain 4 life. | Jonathan Kuo

Pouncing Shoreshark | Creature | Shark Beast | Mutate {3}{U} (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.) Flash Whenever this creature mutates, you may return target creature an opponent controls to its owner's hand. | Dan Scott

Unbreakable Bond | Sorcery | | Return target creature card from your graveyard to the battlefield with a lifelink counter on it. | Randy Vargas

Clash of Titans | Instant | | Target creature fights another target creature. (Each deals damage equal to its power to the other.) | Viktor Titov

Rooting Moloch | Creature | Lizard | When Rooting Moloch enters the battlefield, exile target card with a cycling ability from your graveyard. Until the end of your next turn, you may play that card. Cycling {2} ({2}, Discard this card: Draw a card.) | Andrey Kuzinskiy

Auspicious Starrix | Creature | Elk Beast | Mutate {5}{G} (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.) Whenever this creature mutates, exile cards from the top of your library until you exile X permanent cards, where X is the number of times this creature has mutated. Put those permanent cards onto the battlefield. | Lucas Graciano

Monstrous Step | Sorcery | | Target creature gets +7/+7 until end of turn. Up to one other target creature blocks it this turn if able. Cycling {2} ({2}, Discard this card: Draw a card.) | Chris Seaman