I feel like the creature token ought to be a Pegasus Unicorn Pony. Earth ponies have their own special attributes (greater physical strength, connection with plants and animals) that the other types don't share, but the alicorns do share them.
"1, T: Destroy target creature that shares a color with mana spent to activate this ability. Put an element counter on Elements of Harmony. Spend only colored mana to activate this ability. 1, T, Remove six element counters from Elements of Harmony and sacrifice it: Put a colorless 6/6 Pegasus Unicorn creature token with "T: Destroy target colored creature." onto the battlefield."