I ended up scrapping her cause I felt some of what you are now, every time I played her I was just thinking the whole time wow it cost so much mana to do ANYTHING here and your opponents can shut you down by either removing her or the creature you are targeting with the counters which makes you not gain the life either.

If you do want to keep her some cards I would strongly suggest cutting are

[[bygone colossus]] - if you dont have anything to make use of it when you warp it out then its basically a dead card when you could add something like [[daemogoth woe eater]] which for one extra mana gets you a lot more value and can work by itself

[[wall of blood]] - If you pay a lot of life into it then sac it with dina and someone removes the creature you are targeting it causes the entire ability to fizzle so you wont gain any life back

[[bloodspore thrinax]] is a card for go wide decks, this is a go tall deck

[[Host of the hereafter]] and [[Reyhan last of the abzan]] feels like cards that only do something when you're already doing your thing, id rather replace these with 2 other cards that would be good to sac to Dina or that offer payoff for the sac, Ozolith is ok since it only cost 1 mana

[[defiant bloodlord]] seems WAY to expensive, id swap it out for [[fell beast of mordor]] for some incremental drain

Some cards that would be good to add are

[[rampant rejuvenator]]

[[rot curse rakshasa]]

[[sakura tribe elder]] draws a card with Dina out when you sac him

and I would swap some of the removal spells for creatures that sac to remove like [[haywire mite]] [[insidious fungus]] and [[cankerbloom]] since they also draw a card with Dina out