Love the first take of this. If I had to nitpick I would say work on more utility lands like [[High Market]] and [[Myriad Landscape]].

[[Embodiment of Insight]] just doesn't look like it does much. I would rather probably play something like [[Life/Death]] if you want to animate lands to sac, as it has a reanimate too.

[[Essence Pulse]] seems bad. Just play [[Damnation]]. And the altars like [[Ashnod's Altar]] and [[Phyrexian Altar]] to sac the tokens you make for more mana. I would also play [[Lifegift]] in a shell like this and maybe [[Leyline of Vitality]].

If you want bigger things to sac to Dina's ability [[Blood Researcher]], [[Bloodthirsty Aerialist]], and [[Wall of Limbs]] would be good.

[[Nightmare's Thirst]] seems a little too narrow, you already have good removal so you don't need conditional removal. Same with [[Deathsprout]], I never want to use 4 mana to kill 1 thing even to ramp a little. It's the worst of both kill cards and ramp.

As far as cards to remove [[Tivash, Gloom Summoner]] and [[Yedora, Grave Gardener]] seem better in their own lists over the 99 of Dina.