Alchemy: Ixalan

Mycoid Resurrection

Mycoid Resurrection {4}{B}{G}

Sorcery
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

Reflection Net {1}{W}{U}

Artifact
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

Scalesoul Gnome {3}{R}{W}

Artifact Creature - Gnome
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
Stalwart Speartail

Stalwart Speartail {1}{R}{G}

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
Tan Jolom, the Worldwalker

Tan Jolom, the Worldwalker {1}{G}{W}{U}

Legendary Creature - Spirit
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