Bloomburrow

Plumecreed Mentor | Creature | Bird Scout | Flying Whenever Plumecreed Mentor or another creature you control with flying enters, put a +1/+1 counter on target creature you control without flying. | Henry Peters

Moonrise Cleric | Creature | Bat Cleric | Flying Whenever Moonrise Cleric attacks, you gain 1 life. | Simon Dominic

Zoraline, Cosmos Caller | Legendary Creature | Bat Cleric | Flying, vigilance Whenever a Bat you control attacks, you gain 1 life. Whenever Zoraline enters or attacks, you may pay {W}{B} and 2 life. When you do, return target nonland permanent card with mana value 3 or less from your graveyard to the battlefield with a finality counter on it. | Justin Gerard

Mabel, Heir to Cragflame | Legendary Creature | Mouse Soldier | Other Mice you control get +1/+1. When Mabel, Heir to Cragflame enters, create Cragflame, a legendary colorless Equipment artifact token with "Equipped creature gets +1/+1 and has vigilance, trample, and haste" and equip {2}. | Aurore Folny

Seedglaive Mentor | Creature | Mouse Soldier | Vigilance, haste Valiant — Whenever Seedglaive Mentor becomes the target of a spell or ability you control for the first time each turn, put a +1/+1 counter on it. | Vincent Christiaens

Helga, Skittish Seer | Legendary Creature | Frog Druid | Whenever you cast a creature spell with mana value 4 or greater, you draw a card, gain 1 life, and put a +1/+1 counter on Helga, Skittish Seer. {T}: Add X mana of any one color, where X is Helga, Skittish Seer's power. Spend this mana only to cast creature spells with mana value 4 or greater or creature spells with {X} in their mana costs. | Andrea Piparo

Baylen, the Haymaker | Legendary Creature | Rabbit Warrior | Tap two untapped tokens you control: Add one mana of any color. Tap three untapped tokens you control: Draw a card. Tap four untapped tokens you control: Put three +1/+1 counters on Baylen, the Haymaker. It gains trample until end of turn. | Ryan Pancoast