The attack power of 2600, which is a condition for specifying an earth attribute that is not in the theme and for additional enhancement, appears to have Buster Blader in mind, and can also be achieved as a Speed Officer within the theme
Knightmare Phoenix is a Link-2 with 1600ATK and when its Link Summoned, you can discard a card to target and destroy a Spell/Trap on the field
You also get perfect color fixing from it if you have six or more lands
Cards like Will of the Jeskai, Reforge the Soul, and Windfall are The Emperors best friends
When viewed in daylight, the card looks clean
Tellah, Great Sage is a little vulnerable to removal since its only a 3/3, but untap with this in a good spells deck and I cant imagine youd lose very often