Urtet will give me a Myr creature token when I cast a Myr spell, and Reckless Fireweaver will push out 1 damage for each Myr entering the battlefield
Of course, this card was introduced long before Commander was created, but due to the prevalence of mana rocks and various token types (specifically Treasures, Food and Clues) in the format, it can truly sing in a Treefolk build facing off against an artifact-heavy pod (which is most of them)
If you find yourself looking over all of the cards in the set - once its been revealed - and you only want a few of them, buy Singles

Section 25 Summary Input: One playing of Coastal Drake Output: Lots of reuse of Tundra Kavu Layer count: For each Bloodbond March, for each Clash of Realities on a new Mimic Vat, for each Guilty Conscience on Mimic Vat, for each Rite of Passage putting counters on Mimic Vat, for each Doubling Season on the Rite of Passage counters added to Mimic Vat, for each Rings of Brighthearth on Sinking Feeling's ability while it's attached to Mimic Vat, for each Rings of Brighthearth on Mimic Vat's ability, for each Clash of Realities on Coastal Drake, for each Guilty Conscience on Coastal Drake, for each Rite of Passage putting counters on Coastal Drake, for each Doubling Season on the Rite of Passage counters added to Coastal Drake, for each Rings of Brighthearth on Sinking Feeling's ability while it's attached to Coastal Drake, for each Rings of Brighthearth on Coastal Drake's ability, for each Grip of Chaos, for each Psychic Battle...15