Ikoria: Lair of Behemoths

Mythos of Snapdax | Sorcery | | Each player chooses an artifact, a creature, an enchantment, and a planeswalker from among the nonland permanents they control, then sacrifices the rest. If {B}{R} was spent to cast this spell, you choose the permanents for each player instead. | Seb McKinnon

Mythos of Illuna | Sorcery | | Create a token that's a copy of target permanent. If {R}{G} was spent to cast this spell, instead create a token that's a copy of that permanent, except the token has "When this permanent enters the battlefield, if it's a creature, it fights up to one target creature you don't control." | Seb McKinnon

Everquill Phoenix | Creature | Phoenix | Mutate {3}{R} (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.) Flying Whenever this creature mutates, create a red artifact token named Feather with "{1}, Sacrifice Feather: Return target Phoenix card from your graveyard to the battlefield tapped." | Lie Setiawan

Mythos of Vadrok | Sorcery | | Mythos of Vadrok deals 5 damage divided as you choose among any number of target creatures and/or planeswalkers. If {W}{U} was spent to cast this spell, until your next turn, those permanents can't attack or block and their activated abilities can't be activated. | Seb McKinnon

Whirlwind of Thought | Enchantment | | Whenever you cast a noncreature spell, draw a card. | Bram Sels

Song of Creation | Enchantment | | You may play an additional land on each of your turns. Whenever you cast a spell, draw two cards. At the beginning of your end step, discard your hand. | Noah Bradley