Bloomburrow

Daring Waverider | Creature | Otter Wizard | When Daring Waverider enters, you may cast target instant or sorcery card with mana value 4 or less from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead. | Wisnu Tan

Rottenmouth Viper | Creature | Elemental Snake | As an additional cost to cast this spell, you may sacrifice any number of nonland permanents. This spell costs {1} less to cast for each permanent sacrificed this way. Whenever Rottenmouth Viper enters or attacks, put a blight counter on it. Then for each blight counter on it, each opponent loses 4 life unless that player sacrifices a nonland permanent or discards a card. | Andrea Piparo

Wick's Patrol | Creature | Rat Warlock | When Wick's Patrol enters, mill three cards. When you do, target creature an opponent controls gets -X/-X until end of turn, where X is the greatest mana value among cards in your graveyard. | Dmitry Burmak

Galewind Moose | Creature | Elemental Elk | Flash Vigilance, reach, trample | Valera Lutfullina

Lumra, Bellow of the Woods | Legendary Creature | Elemental Bear | Vigilance, reach Lumra, Bellow of the Woods's power and toughness are each equal to the number of lands you control. When Lumra enters, mill four cards. Then return all land cards from your graveyard to the battlefield tapped. | Matt Stewart

Byrke, Long Ear of the Law | Legendary Creature | Rabbit Soldier | Vigilance When Byrke, Long Ear of the Law enters, put a +1/+1 counter on each of up to two target creatures. Whenever a creature you control with a +1/+1 counter on it attacks, double the number of +1/+1 counters on it. | Manuel Castañón