Recommendations:

R/W Soldier Creatures - Kalemne, Disciple of Iroas, Iroas's Champion, Hearthfire Hobgoblin Three powerful double strikers and two of which should be includes just since Iroas is your commander. Soltari Guerrillas Personal favorite of mine Lightning bolt on a body, great for removing pesky low toughness creatures with annoying abilities.

Artifacts/Enchantments - Konda's Banner, Herald's Horn, Obelisk of Urd These three are amazing with tribal decks. Sunforger, Legion's Initiative these two can give you responses Sunforger can tutor any of your instants and Legions Inititive can protect you from a board wipe unfortunately tokens will still be lost as they cease to exist when they leave battlefield.

Lands - Replace Sunscorched Desert with Bojuka Bog <- makes colorless in your deck and the ability to exile an opponents graveyard is a powerful ability.

Sorcery/Instants - Ghostway, Faith's Reward, Eerie Interlude cards to prevent you from losing creatures due to a boardwipe, these can also be tutored if you decide to add the Sunforger to your deck.

Edit: Made an error Bojuka Bog wouldn't be legal in this deck, because it has a black mana symbol in is card text. Was thinking of cards along the lines of the fetches that don't seem to care about color Flooded Strand Bloodstained Mire Wooded Foothills Windswept Heath would all be legal in this deck since their identity is colorless.