
Dracogenesis | Enchantment | | You may cast Dragon spells without paying their mana costs. | Kai Carpenter

Craterhoof Behemoth | Creature | Beast | Haste
When this creature enters, creatures you control gain trample and get +X/+X until end of turn, where X is the number of creatures you control. | Magali Villeneuve

Jeskai Revelation | Instant | | Return target spell or permanent to its owner's hand. Jeskai Revelation deals 4 damage to any target. Create two 1/1 white Monk creature tokens with prowess. Draw two cards. You gain 4 life. | Igor Grechanyi

Death Begets Life | Sorcery | | Destroy all creatures and enchantments. Draw a card for each permanent destroyed this way. | Justin Hernandez & Alexis Hernandez

Ureni, the Song Unending | Legendary Creature | Spirit Dragon | Flying, protection from white and from black
When Ureni enters, it deals X damage divided as you choose among any number of target creatures and/or planeswalkers your opponents control, where X is the number of lands you control. | Alexander Ostrowski

Ugin, Eye of the Storms | Legendary Planeswalker | Ugin | When you cast this spell, exile up to one target permanent that's one or more colors.
Whenever you cast a colorless spell, exile up to one target permanent that's one or more colors.
+2: You gain 3 life and draw a card.
0: Add {C}{C}{C}.
−11: Search your library for any number of colorless nonland cards, exile them, then shuffle. Until end of turn, you may cast those cards without paying their mana costs. | Joshua Raphael