Sry, I forgot 1 very important suggestion: [Cradle of Vitality] is essential

For sideboard you can get pretty creative, but pack a catch all prevent dmg to gain life spell like [Chant of the Vitu-Ghazi], a board wipe [Sunscour], an artifact/enchantment wipe [Abolish], and an anthem pump of some sort.

Other relevant life cards to swap in for fun comboing are[Wall of Reverence][Well of Lost Dreams][Sunbond][Archangel of Thune][Phyrexian Processor][Serra Avatar][Transcendant Master][Moltensteel Dragon][Chalice of Life]. Any of these would add a hell of a lot to the deck, but it would also essentially be a different deck if you did!

Exept this is a super cool budget life gain deck that looks really good

Serra Ascendent*

Have you thought about Crested Sunmare? Also Authority of the Consuls is a great way to slow down cards with Haste.

I would throw in Grand Abolished into your sideboard, so you have a chance against blue spells

Abolisher*^

I like the part where you gain life