Foundations

Guarded Heir | Creature | Human Noble | Lifelink (Damage dealt by this creature also causes you to gain that much life.) When this creature enters, create two 3/3 white Knight creature tokens. | Craig J Spearing

Curator of Destinies | Creature | Sphinx | This spell can't be countered. Flying When this creature enters, look at the top five cards of your library and separate them into a face-down pile and a face-up pile. An opponent chooses one of those piles. Put that pile into your hand and the other into your graveyard. | Ralph Horsley

Grappling Kraken | Creature | Kraken | Landfall — Whenever a land you control enters, tap target creature an opponent controls and put a stun counter on it. (If a permanent with a stun counter would become untapped, remove one from it instead.) | Ben Wootten

Arbiter of Woe | Creature | Demon | As an additional cost to cast this spell, sacrifice a creature. Flying When this creature enters, each opponent discards a card and loses 2 life. You draw a card and gain 2 life. | Jim Pavelec

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

Shivan Dragon | Creature | Dragon | Flying (This creature can't be blocked except by creatures with flying or reach.) {R}: Shivan Dragon gets +1/+0 until end of turn. | Donato Giancola

Apothecary Stomper | Creature | Elephant | Vigilance (Attacking doesn't cause this creature to tap.) When this creature enters, choose one — • Put two +1/+1 counters on target creature you control. • You gain 4 life. | Edgar Sánchez Hidalgo

Quakestrider Ceratops | Creature | Dinosaur | | Josiah "Jo" Cameron

Quilled Greatwurm | Creature | Wurm | Trample Whenever a creature you control deals combat damage during your turn, put that many +1/+1 counters on it. (It must survive to get the counters.) You may cast this card from your graveyard by removing six counters from among creatures you control in addition to paying its other costs. | Michal Ivan

Affectionate Indrik | Creature | Beast | When Affectionate Indrik enters, you may have it fight target creature you don't control. (Each deals damage equal to its power to the other.) | Steve Prescott

Niv-Mizzet, Visionary | Legendary Creature | Dragon Wizard | Flying You have no maximum hand size. Whenever a source you control deals noncombat damage to an opponent, you draw that many cards. | Dan Murayama Scott

Muldrotha, the Gravetide | Legendary Creature | Elemental Avatar | During each of your turns, you may play a land and cast a permanent spell of each permanent type from your graveyard. (If a card has multiple permanent types, choose one as you play it.) | Jason Rainville