Isu the Abominable is a mythic Legendary Snow Creature — Yeti card from Jumpstart 2022 (J22), collector number 12. Current market price: $3.38, TCGplayer market prices via Scryfall.
You may look at the top card of your library any time. You may play snow lands and cast snow spells from the top of your library. Whenever another snow permanent you control enters, you may pay {G}, {W}, or {U}. If you do, put a +1/+1 counter on Isu.