Spirit Link is Lifelink and Pacifism for 1 mana.

if this is truly supposed to be modern and not casual Time Spiral , Congregate and Brainstorm are illegal.

card:Golem's Heart seems like a waste. With all these expensive creatures you should have some ramp. Azorius Signet , Gilded Lotus or Solemn Simulacrum might fin in here.

Thanks

I didn't notice before but 18 lands is too few. You'd probably want 21-24 especially with such expensive cards.

cool

If the deck is focusing around Martyr of Sands it should really be mono white so you get full benefit. imo i would drop most of the big creatures for faster one or creatures that take advantage of lifegain better. i would switch Serra Angel for Serra Avenger and i would add 2 more Serra Ascendant i would keep the 1xFelidar Sovereign add 1xBaneslayer Angel . you should also deff add 4xcard:Ajani's Pridemate and maybe 4xHonor of the Pure and 4xSquadron Hawk i'd also take the expensive enchantments and artifacts to make the deck faster, other wise i love the deck and theme +1 check out my modern bant deck smells like troll spirit, if you want