The Lost Caverns of Ixalan

Vito, Fanatic of Aclazotz | Legendary Creature | Vampire Demon | Flying Whenever you sacrifice another permanent, you gain 2 life if this is the first time this ability has resolved this turn. If it's the second time, each opponent loses 2 life. If it's the third time, create a 4/3 white and black Vampire Demon creature token with flying. | Marta Nael

Caparocti Sunborn | Legendary Creature | Human Soldier | Whenever Caparocti Sunborn attacks, you may tap two untapped artifacts and/or creatures you control. If you do, discover 3. (Exile cards from the top of your library until you exile a nonland card with mana value 3 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.) | Donato Giancola

Sovereign Okinec Ahau | Legendary Creature | Cat Noble | Ward {2} Whenever Sovereign Okinec Ahau attacks, for each creature you control with power greater than that creature's base power, put a number of +1/+1 counters on that creature equal to the difference. | Victor Adame Minguez

The Belligerent | Legendary Artifact | Vehicle | Whenever The Belligerent attacks, create a Treasure token. Until end of turn, you may look at the top card of your library any time, and you may play lands and cast spells from the top of your library. Crew 3 | Bruce Brenneise

Deepfathom Echo | Creature | Merfolk Spirit | At the beginning of combat on your turn, Deepfathom Echo explores. Then you may have it become a copy of another creature you control until end of turn. (To have this creature explore, 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 this creature, then put the card back or put it into your graveyard.) | Matt Stewart