Rivals of Ixalan

Cacophodon | Creature | Dinosaur | Enrage — Whenever Cacophodon is dealt damage, untap target permanent. | Johann Bodin

Cherished Hatchling | Creature | Dinosaur | When Cherished Hatchling dies, you may cast Dinosaur spells this turn as though they had flash, and whenever you cast a Dinosaur spell this turn, it gains "When this creature enters the battlefield, you may have it fight another target creature." | Sam Rowan

Crested Herdcaller | Creature | Dinosaur | Trample When Crested Herdcaller enters the battlefield, create a 3/3 green Dinosaur creature token with trample. | Lucas Graciano

Enter the Unknown | Sorcery | | Target creature you control explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on the creature, then put the card back or put it into your graveyard.) You may play an additional land this turn. | Howard Lyon

Forerunner of the Heralds | Creature | Merfolk Scout | When Forerunner of the Heralds enters the battlefield, you may search your library for a Merfolk card, reveal it, then shuffle and put that card on top. Whenever another Merfolk enters the battlefield under your control, put a +1/+1 counter on Forerunner of the Heralds. | Chris Seaman

Strength of the Pack | Sorcery | | Put two +1/+1 counters on each creature you control. | Tomasz Jedruszek

Swift Warden | Creature | Merfolk Warrior | Flash When Swift Warden enters the battlefield, target Merfolk you control gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.) | Viktor Titov

Thrashing Brontodon | Creature | Dinosaur | {1}, Sacrifice Thrashing Brontodon: Destroy target artifact or enchantment. | Jakub Kasper

Thunderherd Migration | Sorcery | | As an additional cost to cast this spell, reveal a Dinosaur card from your hand or pay {1}. Search your library for a basic land card, put it onto the battlefield tapped, then shuffle. | Lars Grant-West

Atzocan Seer | Creature | Human Druid | {T}: Add one mana of any color. Sacrifice Atzocan Seer: Return target Dinosaur card from your graveyard to your hand. | Joseph Meehan

Merfolk Mistbinder | Creature | Merfolk Shaman | Other Merfolk you control get +1/+1. | Clint Cearley

Jungle Creeper | Creature | Elemental | {3}{B}{G}: Return Jungle Creeper from your graveyard to your hand. | Matt Stewart

Raging Regisaur | Creature | Dinosaur | Whenever Raging Regisaur attacks, it deals 1 damage to any target. | Bayard Wu

Foul Orchard | Land | | Foul Orchard enters the battlefield tapped. {T}: Add {B} or {G}. | Yeong-Hao Han

Woodland Stream | Land | | Woodland Stream enters the battlefield tapped. {T}: Add {G} or {U}. | James Paick