Pioneer Masters

Day's Undoing | Sorcery | | Each player shuffles their hand and graveyard into their library, then draws seven cards. If it's your turn, end the turn. (Exile all spells and abilities from the stack, including this card. Discard down to your maximum hand size. Damage wears off, and "this turn" and "until end of turn" effects end.) | Jonas De Ro

Jace, Vryn's Prodigy | Legendary Creature | Human Wizard | {T}: Draw a card, then discard a card. If there are five or more cards in your graveyard, exile Jace, Vryn's Prodigy, then return him to the battlefield transformed under his owner's control. | Jaime Jones

Temporal Trespass | Sorcery | | Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) Take an extra turn after this one. Exile Temporal Trespass. | Clint Cearley

Thassa, God of the Sea | Legendary Enchantment Creature | God | Indestructible As long as your devotion to blue is less than five, Thassa isn't a creature. (Each {U} in the mana costs of permanents you control counts toward your devotion to blue.) At the beginning of your upkeep, scry 1. {1}{U}: Target creature you control can't be blocked this turn. | Jason Chan

Jace, Architect of Thought | Legendary Planeswalker | Jace | +1: Until your next turn, whenever a creature an opponent controls attacks, it gets -1/-0 until end of turn. −2: Reveal the top three cards of your library. An opponent separates those cards into two piles. Put one pile into your hand and the other on the bottom of your library in any order. −8: For each player, search that player's library for a nonland card and exile it, then that player shuffles. You may cast those cards without paying their mana costs. | Jaime Jones

Jace, Memory Adept | Legendary Planeswalker | Jace | +1: Draw a card. Target player mills a card. 0: Target player mills ten cards. −7: Any number of target players each draw twenty cards. | D. Alexander Gregory

Enter the Infinite | Sorcery | | Draw cards equal to the number of cards in your library, then put a card from your hand on top of your library. You have no maximum hand size until your next turn. | Lindsey Look

Dragonlord Ojutai | Legendary Creature | Elder Dragon | Flying Dragonlord Ojutai has hexproof as long as it's untapped. Whenever Dragonlord Ojutai deals combat damage to a player, look at the top three cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order. | Chase Stone

Ephara, God of the Polis | Legendary Enchantment Creature | God | Indestructible As long as your devotion to white and blue is less than seven, Ephara isn't a creature. At the beginning of each upkeep, if you had another creature enter the battlefield under your control last turn, draw a card. | Eric Deschamps

Narset Transcendent | Legendary Planeswalker | Narset | +1: Look at the top card of your library. If it's a noncreature, nonland card, you may reveal it and put it into your hand. −2: When you next cast an instant or sorcery spell from your hand this turn, it gains rebound. (Exile the spell as it resolves. At the beginning of your next upkeep, you may cast that card from exile without paying its mana cost.) −9: You get an emblem with "Your opponents can't cast noncreature spells." | Magali Villeneuve

Dragonlord Silumgar | Legendary Creature | Elder Dragon | Flying, deathtouch When Dragonlord Silumgar enters, gain control of target creature or planeswalker for as long as you control Dragonlord Silumgar. | Steven Belledin

Phenax, God of Deception | Legendary Enchantment Creature | God | Indestructible As long as your devotion to blue and black is less than seven, Phenax isn't a creature. Creatures you control have "{T}: Target player mills X cards, where X is this creature's toughness." | Ryan Barger

Ashiok, Nightmare Weaver | Legendary Planeswalker | Ashiok | +2: Exile the top three cards of target opponent's library. −X: Put a creature card with mana value X exiled with Ashiok, Nightmare Weaver onto the battlefield under your control. That creature is a Nightmare in addition to its other types. −10: Exile all cards from all opponents' hands and graveyards. | Karla Ortiz

Epic Experiment | Sorcery | | Exile the top X cards of your library. You may cast instant and sorcery spells with mana value X or less from among them without paying their mana costs. Then put all cards exiled this way that weren't cast into your graveyard. | Dan Murayama Scott

Keranos, God of Storms | Legendary Enchantment Creature | God | Indestructible As long as your devotion to blue and red is less than seven, Keranos isn't a creature. Reveal the first card you draw on each of your turns. Whenever you reveal a land card this way, draw a card. Whenever you reveal a nonland card this way, Keranos deals 3 damage to any target. | Daarken

Progenitor Mimic | Creature | Shapeshifter | You may have Progenitor Mimic enter as a copy of any creature on the battlefield, except it has "At the beginning of your upkeep, if this creature isn't a token, create a token that's a copy of this creature." | Daarken

Kruphix, God of Horizons | Legendary Enchantment Creature | God | Indestructible As long as your devotion to green and blue is less than seven, Kruphix isn't a creature. You have no maximum hand size. If you would lose unspent mana, that mana becomes colorless instead. | Daarken

Kiora, the Crashing Wave | Legendary Planeswalker | Kiora | +1: Until your next turn, prevent all damage that would be dealt to and dealt by target permanent an opponent controls. −1: Draw a card. You may play an additional land this turn. −5: You get an emblem with "At the beginning of your end step, create a 9/9 blue Kraken creature token." | Scott M. Fischer

Sarkhan Unbroken | Legendary Planeswalker | Sarkhan | +1: Draw a card, then add one mana of any color. −2: Create a 4/4 red Dragon creature token with flying. −8: Search your library for any number of Dragon creature cards, put them onto the battlefield, then shuffle. | Aleksi Briclot