Foundations

Arahbo, the First Fang | Legendary Creature | Cat Avatar | Other Cats you control get +1/+1. Whenever Arahbo or another nontoken Cat you control enters, create a 1/1 white Cat creature token. | Simon Dominic

Celestial Armor | Artifact | Equipment | Flash (You may cast this spell any time you could cast an instant.) When this Equipment enters, attach it to target creature you control. That creature gains hexproof and indestructible until end of turn. Equipped creature gets +2/+0 and has flying. Equip {3}{W} ({3}{W}: Attach to target creature you control. Equip only as a sorcery.) | Olena Richards

Kiora, the Rising Tide | Legendary Creature | Merfolk Noble | When Kiora enters, draw two cards, then discard two cards. Threshold — Whenever Kiora attacks, if there are seven or more cards in your graveyard, you may create Scion of the Deep, a legendary 8/8 blue Octopus creature token. | Julian Kok Joon Wen

Lunar Insight | Sorcery | | Draw a card for each different mana value among nonland permanents you control. | Dan Murayama Scott

Abyssal Harvester | Creature | Demon Warlock | {T}: Exile target creature card from a graveyard that was put there this turn. Create a token that's a copy of it, except it's a Nightmare in addition to its other types. Then exile all other Nightmare tokens you control. | Diana Franco

Nine-Lives Familiar | Creature | Cat | This creature enters with eight revival counters on it if you cast it. When this creature dies, if it had a revival counter on it, return it to the battlefield with one fewer revival counter on it at the beginning of the next end step. | Bram Sels

Phyrexian Arena | Enchantment | | At the beginning of your upkeep, you draw a card and you lose 1 life. | Svetlin Velinov

Electroduplicate | Sorcery | | Create a token that's a copy of target creature you control, except it has haste and "At the beginning of the end step, sacrifice this token." Flashback {2}{R}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.) | Warren Mahy

Flamewake Phoenix | Creature | Phoenix | Flying, haste Flamewake Phoenix attacks each combat if able. Ferocious — At the beginning of combat on your turn, if you control a creature with power 4 or greater, you may pay {R}. If you do, return Flamewake Phoenix from your graveyard to the battlefield. | Min Yum

Slagstorm | Sorcery | | Choose one — • Slagstorm deals 3 damage to each creature. • Slagstorm deals 3 damage to each player. | Dan Murayama Scott

Loot, Exuberant Explorer | Legendary Creature | Beast Noble | You may play an additional land on each of your turns. {4}{G}{G}, {T}: Look at the top six cards of your library. You may reveal a creature card with mana value less than or equal to the number of lands you control from among them and put it onto the battlefield. Put the rest on the bottom in a random order. | Arif Wijaya

Mossborn Hydra | Creature | Elemental Hydra | Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.) This creature enters with a +1/+1 counter on it. Landfall — Whenever a land you control enters, double the number of +1/+1 counters on this creature. | Monztre

Spinner of Souls | Creature | Spider Spirit | Reach Whenever another nontoken creature you control dies, you may reveal cards from the top of your library until you reveal a creature card. Put that card into your hand and the rest on the bottom of your library in a random order. | Xavier Ribeiro

Sylvan Scavenging | Enchantment | | At the beginning of your end step, choose one — • Put a +1/+1 counter on target creature you control. • Create a 3/3 green Raccoon creature token if you control a creature with power 4 or greater. | Josiah "Jo" Cameron

Elvish Archdruid | Creature | Elf Druid | Other Elf creatures you control get +1/+1. {T}: Add {G} for each Elf you control. | Karl Kopinski

Genesis Wave | Sorcery | | Reveal the top X cards of your library. You may put any number of permanent cards with mana value X or less from among them onto the battlefield. Then put all cards revealed this way that weren't put onto the battlefield into your graveyard. | Arif Wijaya

Alesha, Who Laughs at Fate | Legendary Creature | Human Warrior | First strike Whenever Alesha attacks, put a +1/+1 counter on it. Raid — At the beginning of your end step, if you attacked this turn, return target creature card with mana value less than or equal to Alesha's power from your graveyard to the battlefield. | Ekaterina Burmak

Maelstrom Pulse | Sorcery | | Destroy target nonland permanent and all other permanents with the same name as that permanent. | John Avon

Scrawling Crawler | Artifact Creature | Phyrexian Construct | At the beginning of your upkeep, each player draws a card. Whenever an opponent draws a card, that player loses 1 life. | Miro Petrov