Jeskai Sunbond Sage

For starters, I would consider tossing Seeker of the Way and even Ajani's Pridemate into the mainboard.  Ajani Steadfast also strikes me as being more reliable than Sage of the Inward Eye - reduced cost, more consistent, immediate board impact, etc.

Having said that much, I do think that, by moving out of green, you really are limiting your ability to place +1/+1 counters on Sage of Hours.  Red here really only gives you Sage of the Inward Eye and Jeskai Charm, while green would give you a wealth of options from Ranger's Guile (which protects sage while also triggering heroic), to Ajani, Mentor of Heroes, to Hardened Scales or even Solidarity of Heroes.  All these options will help you build sage in addition to the sunbond combo... remember that redundancy is rather important for any combo deck.

That being said, if you wanted to disrupt said combo, as currently constructed, the opponent could recognize what you're up to and just be sure to take care of Sage before he really gets anywhere (yes, you have some protection for him, but then you're sitting on him in your hand or taking forever to get the combo rolling).  Utter End will simply get rid of him, as would enchantment removal for Sunbond.  Silence the Believers, similar to Utter End, exiles...  etc.  Personally, if I were playing against you, I would just hold up two removal spells and let you put Sunbond on him and then go for the 2-for-1, let you try to counter, and play the other removal in response - netting a 3-for-2, but also really neutering your deck as, without the combo, it doesn't really have much punch from what I can see.

Although I dislike hate cards, I will mention the appropriate one. Ugin's Nexus