Training Grounds also reduces the cost of
Knight of the Holy Nimbus' activated ability, so opponents don't have to pay 2 to destroy him. That's quite an argument against playing him.
Big Game Hunter could be a nice addition to the deck. You can get him out via the rebels ability and even if you draw him, you can still shuffle him back with
Brainstorm. I would try to fit in some flyer's and
Umezawa's Jitte. With that shitload of shuffle effects, you should be able to find Jitte early on.
Aven Riftwatcher could be a nice addition to the deck against aggro strategies to stabilize before you get the Counterbalance softlock into play. He is also good at wearing Jitte. Hell, even
Zealot Il-Vec could be good at wearing Jitte or destroying utility creatures like
Dark Confidant or
Noble Hierarch. I most likely would replace
Amrou Scout with
Defiant Falcon, if you're going to play equipments. Both have Thoughness 1, but the Falcon has evasion, which is really needed with equipments.
Dunerider Outlaw could be a good sideboard option against Bant Decks. Every Critter they play is green and you can fetch him really early on with
Ramosian Sergeant. He should grow really fast.