Its three currencies (Coins for cosmetics, Credits for crafting, and Crystals for extra rewards and perks) are all earned by playing the game and claiming them from daily missions, the Battle Pass, and the like
The Forest Version 36 Spells Mox Opal Chrome Mox Lotus Petal Lion's Eye Diamond Lotus Bloom Mana Vault Tinder Wall Elixir of Immortality Birds of Paradise Goblin Welder Expedition Map Chromatic Star Faithless Looting Gitaxian Probe Preordain Conjurer's Bauble 5x Talisman Simic Signet Demonic Tutor Land Grant Spellskite* Nature's Lore Balance* Tinker Intuition Elvish Spirit Guide Simian Spirit Guide Thirst for Knowledge Goblin Charbelcher Daretti, Scrap Savant Thoughtcast Chancellor of the Tangle 4 Land Breeding Pool Stomping Ground Taiga Tropical Island To fetch out your lands you have Land Grant, Nature's Lore, Expedition Map and Intuition
Because, of course, you want to get the maximum value out of them, should you ever sell them
Despite being its final year, the Nintendo tabletop game hasn't slowed down and has already released two major sets Brilliant Stars and Astral Radiance