Rivals of Ixalan

Tetzimoc, Primal Death | Legendary Creature | Elder Dinosaur | Deathtouch {B}, Reveal Tetzimoc, Primal Death from your hand: Put a prey counter on target creature. Activate only during your turn. When Tetzimoc enters the battlefield, destroy each creature your opponents control with a prey counter on it. | Zack Stella

Etali, Primal Storm | Legendary Creature | Elder Dinosaur | Whenever Etali, Primal Storm attacks, exile the top card of each player's library, then you may cast any number of spells from among those cards without paying their mana costs. | Raymond Swanland

Colossal Dreadmaw | Creature | Dinosaur | Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.) | Jesper Ejsing

Azor, the Lawbringer | Legendary Creature | Sphinx | Flying When Azor, the Lawbringer enters the battlefield, each opponent can't cast instant or sorcery spells during that player's next turn. Whenever Azor attacks, you may pay {X}{W}{U}{U}. If you do, you gain X life and draw X cards. | Ryan Pancoast