If you don't want to sacrifice the clue tokens for cards you can instead use them to give Ezrim hexproof, vigilance, or lifelink at instant-speed
These 1-mana landcyclers from Lord of the Rings usually replace a basic land in your deck but have the option of being an impactful spell later in the game
Cerberus Final Fantasy NM-Mint, English NM-Mint, English 3 In Stock NM-Mint, English, 3 In Stock
If it didn't disappear at the upkeep, it would be something you could dump extra mana into to keep it advantageous to pay into
5 Taeko, The Patient Avalanche Anime - $24.12 A pretty unique legendary creature, Taeko, the Patient Avalanche is a Turtle Ninja, which is amazing to start, especially given their headband
Kutzils Flanker Bloodcrazed Paladin may not have blown the bloody doors off back in the day, but Kutzil's Flanker is a really decent answer to Sunfall