Spoilers

Merfolk Tunnel-Guide - UG

Creature - Merfolk Wizard (Uncommon)

When Merfolk Tunnel-Guide enters the battlefield, you get a three-time boon with "Whenever one or more Merfolk enter the battlefield under your control, target Merfolk creature you control explores."

2/2

Mycoid Resurrection - 4BG

Sorcery (Rare)

Fathomless descent - Each creature card in your graveyard perpetually gets +X/+X, where X is the number of permanent cards in your graveyard. Then return a creature card from your graveyard to the battlefield.

Reflection Net - 1WU

Artifact (Uncommon)

Flash

When Reflection Net enters the battlefield, exile target creature until Reflection Net leaves the battlefield.

2: Target creature you control becomes a copy of a creature card exiled with Reflection Net. Activate only as a sorcery and only once.

Scalesoul Gnome - 3RW

Artifact Creature - Gnome (Rare)

Trample, Haste Whenever Scalesoul Gnome deals combat damage to a player, discover X, where X is that damage.

Whenever you play a card from exile, conjure a duplicate of it into your hand.

3/5

Tan Jolom, the Worldwalker - 1GWU

Legendary Creature - Spirit (Rare)

At the beginning of combat on your turn, choose up to one target artifact or land you control that isn't a creature or token. Until end of turn, it becomes a 3/3 Spirit creature with vigilance and double team in addition to its other types.

3/3

Mycelic Ballad - 3B

Sorcery - Chorus (Rare)

Starting intensity 2 Each player sacrifices X creatures and you gain X life, where X is this spell's intensity.

All Chorus cards you own intensify by 1.

Phantasmal Extraction - 1U

Sorcery (Uncommon)

If you weren't the starting player, this spell costs less to cast.

Target opponent reveals each nonland card in their hand with mana value 4 or less. Choose a card revealed this way or a card in their graveyard. Exile that card.

Stalwart Speartail - 1RG

Creature - Dinosaur

Enrage - Whenever Stalwart Speartail is dealt damage, other Dinosaurs you control and Dinosaur cards in your hand and library perpetually get +1/+1.

Whenever Stalwart Speartail attacks, you may pay 3. When you do, Stalwart Speartail deals 1 damage to each creature and each planeswalker.

4/4