mtg horse cards Guardian Sunmare | Aetherdrift | Standard The Lord of the Rings Top 10 Horses in Magic:

1Mountain Valley

And since Lyra is both cheaper and more proven right now, why not just grab a couple of those if youre going to invest along these lines

See a Brand New Card From Magic: The Gathering's Dominaria United Set Serra Paragon ties neatly into 30 years of worldbuilding

This forces you to look at all your cards in a very different way and likely creates a very different type of deck

Brothers Yamazaki You cant technically have more than one copy of Brothers Yamazaki in a singleton deck, though you may be able to do it after a Rule 0 discussion

With Search for Glory and Thalias Lancers already present in the deck, finding the other half seems pretty easy