You're absolutelly right, although this I posted with the deck out of my mind from my paper standard deck because I didnt have the deck with me at the time (I´ll update it ASAP) I am using 22 lands instead of 20, but 22 is still working fine for me, 2 different standard games with this deck, never run out of mana, the first one I play with this one, I win 2nd place from 12 people, I only lost to GRB Emerge, it was kinda brutal 2-0 for him, but the others I win 2-0 except from a home brew a guy did, but in that one I win 2-1, 4 rounds in total.
For the second standard I hit 8th place but never because of mana, I was not lucky for an aggro deck, I never drew
engulf the shore and he beat me in turn 4, both times, so I know what is missing on this deck and what to change at least for an temur aggro deck, again 4 rounds, I win 2 and I lost 2 of them. the second one I lost, it was agaist GB counters, I beat him last standard, but this one the 3rd round with him I was again not too lucky but because I kept a wrong hand, and by the time I could do something it was too late.
So in resume the deck works fine with 22 lands, I would go below that but neither above, sometimes depends on the hand that you can keep at the begining, but even when I kept a 3 mana hand, sometimes 2 mana hand but with game in the first 2 or 3 turns never run out of mana, the mana always came at the right moment.
A note I can do, for the the people who´s getting into magic, a little bit like me, it's been only one year I´m playing, I did something agaist the GB Counters I didn't know the deck could do, I stole
Winding Constrictor from the battlefield with
Confiscation Coup, having already
As Foretold in the field, it began to give me 2 counters each turn instead of 1, so I jumped from 1 to 3 in my next turn, 3 to 5, 5 to 7 and so on, so I could counter everything protecting the Constrictor until I get to 11 counters on
As Foretold, and having 10 mana available I then could cast Ulamog for free having my mana open for counters and protect Ulamog agaist
exile spells, it was something I didn´t planned to be honest, and it was such an unplanned play, but it came out just s good as knowing what I was doing, such a rewarding moment on watching the face of the oponent as I was casting Ulamog with a card only his card could give me.
Thanks for the comment and it was a realquestion due to I construced the deck without having the deck fisically. Thanks and if any comment and counsul is well welcomed.
(Sorry for orthography and grammar errors)