Kaldheim

Boreal Outrider | Snow Creature | Elf Warrior | Whenever you cast a creature spell, if {S} of any of that spell's colors was spent to cast it, that creature enters the battlefield with an additional +1/+1 counter on it. ({S} is mana from a snow source.) | Alex Konstad

Gladewalker Ritualist | Creature | Shapeshifter | Changeling (This card is every creature type.) Whenever another creature named Gladewalker Ritualist enters the battlefield under your control, draw a card. | Irina Nordsol

Harald, King of Skemfar | Legendary Creature | Elf Warrior | Menace (This creature can't be blocked except by two or more creatures.) When Harald, King of Skemfar enters the battlefield, look at the top five cards of your library. You may reveal an Elf, Warrior, or Tyvar card from among them and put it into your hand. Put the rest on the bottom of your library in a random order. | Grzegorz Rutkowski

Svella, Ice Shaper | Legendary Snow Creature | Troll Warrior | {3}, {T}: Create a colorless snow artifact token named Icy Manalith with "{T}: Add one mana of any color." {6}{R}{G}, {T}: Look at the top four cards of your library. You may cast a spell from among them without paying its mana cost. Put the rest on the bottom of your library in a random order. | Andrew Mar