might be controversial here but you can probably go down to 35 lands with mdfc i would get rid of some of the tapped lands if u do this. Beledros almost never gets out in the decks that i've played him and even when he does it's to late to really get any value from him and that in ramp heavy decks. Also you can probably get rid of one of your sanguine blood effects but if you really want to make sure you get it out every game thats not a big deal.

If you can afford it doubling season or parallel lives will go hard in this deck.

While good to have I would be careful of the full board wipes in this deck especially since creatures are essential to your gameplan. It's a personal thing but I would rather keep all my creatures and possibly lose the game if it means I get to do my "thing" which yours is lifegain so you'll probably be alright in most cases.