There's a ton of cool tech in this deck, like Skyshroud Blessing and Teferi's Response being awesome ways to protect our animated lands, nonland board wipes like Consuming Tide not touching our lands, and manlands like Faerie Conclave being sources of card draw
Now Theoden did offer some potential perhaps for solo mono- where you have to do everything with one deck
When its controller has three or more Instants or Sorceries in the graveyard, it flips into the Voracious Reader, which has the Prowess mechanic and also makes Instants and Sorceries cast by its controller cost one less generic mana
I might swap out Naya Charm for Boros Charm to double up on the indestructible (since with tokens, Faiths Reward really isnt much of an option)
Various cards can add further power to the deck, such as the Goblin Anarchomancer, which makes green and red spells cheaper by one colourless mana, the Mage Slayer, which promises unblockable damage, or the Rhythm of the Wild enchantment, which protects your own creature spells from counterspells
Accessibility One Piece seems incredibly easy to pick up and play