Bloomburrow

Mistbreath Elder | Creature | Frog Warrior | At the beginning of your upkeep, return another creature you control to its owner's hand. If you do, put a +1/+1 counter on Mistbreath Elder. Otherwise, you may return Mistbreath Elder to its owner's hand. | Jason Kang

Pawpatch Recruit | Creature | Rabbit Warrior | Offspring {2} (You may pay an additional {2} as you cast this spell. If you do, when this creature enters, create a 1/1 token copy of it.) Trample Whenever a creature you control becomes the target of a spell or ability an opponent controls, put a +1/+1 counter on target creature you control other than that creature. | Johan Grenier

Sunshower Druid | Creature | Frog Druid | When Sunshower Druid enters, put a +1/+1 counter on target creature and you gain 1 life. | Tuan Duong Chu

Valley Mightcaller | Creature | Frog Warrior | Trample Whenever another Frog, Rabbit, Raccoon, or Squirrel you control enters, put a +1/+1 counter on Valley Mightcaller. | Matt Stewart