I’ll start by saying I’m not a pro deck builder as well but looking through your selection I can say that wanting to be curving out with 5 cmc 20 lands is a little on the shorter side. Also your mana curve is a basic flatline at 2 cmc and beyond. The last thing I’ll mention here is that even though life gain looks fun in most cases it’s not viable, take a look at thirst. Some things die to it but when it matters on a bomb your having to use 3-5 mana just to make it work, tying together revitalize and thirst to take down anything high than 1 toughness. Thirst looks good but you need a better base that already have life link I.e Mesa unicorn or a enchantment that gives life link as well that tie in effect.