As far as life gaining Plains theres Kabira Crossroads, but it comes in tapped. For life gain I would reccomend going with passive life gain off something like Lifelink instead of actively gaining 2 or 3 life. Some great cards for you to consider are: Moment of Heroism -becasue it adds lifelink and can be used to suprise someone with the +2/+2 and True Conviction -because it adds lifelink, and it converts everything to double strike, its also harder to kill than Kinsbaile Cavalier, but I run both in my knight deck. over all i really like where your going with this deck. keep it up.
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I love the Creativity here. Tribal hounds seems like a great idea. You could run assult strobe for a quick attack boost, or an occasional turn 3 win with immolating souleater if u wanted to.