Sorry Feyamius, but I'm going to have to disagree with a lot of this.
The land base looks fine. You're using absolutely no tap lands, which is ideal. The filter lands sometimes give me trouble, so you may want to swap some of them for lands that tap for any colour.
Mana Confluence,
City of Brass, and
Forbidden Orchard all have small downsides (but you may want to hold off on buying a
City of Brass, it's spiking for some reason).
Instead of increasing the number of lands, increase the mana ramp. I would go with small 1 mana effects to really finish the ramp package.
Wild Growth,
Birds of Paradise,
Llanowar Elves and the like are the ones I usually go for. You can also stick in a
Faeburrow Elder and it's significantly more expensive Counterpart
Bloom Tender.
I've never seen the saga theme been done before, so I'm not sure how it will turn out. Experiment a bit. I think that the blink theme you've included is the best way to get the most value out if the sagas. I would drop some of the counter removal things (your call which ones) and add in some card draw. This will make it so that you're always drawing into more sagas.
Lastly, because sagas naturally feed into the graveyard,
Open the Vaults could be a great late-game card.