I guess but Guildgate and Stomping Ground come out tap (Sorta) So if you wanted like 10 forest and 10 mountain but otherwise it doesn't matter that much. (Doesn't matter ever actually cause this deck breaks one of magic's biggest rules, so just do whatever works for you)
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He probably did it because you can just pay red mana for her.
Call of the kindred and Door of Destinies/Coat of Arms are really good cards with slivers(Call of the kindred is a blue though so I don't know if you would want it in this deck unless you changed the land around)
Mind grind might want to be considered for this deck.
I really suggest multicolored land in any multicolored deck.
:D someone used my idea. I'm happy
I get that just was giving out good mill cards I think mind grind would still fit well in that deck as like a finisher.
Render Silent instead of Syncopate?
For a mill deck you might want to take a look at other cards too. Like Traumatize, Consuming Aberration, Naephalia Drownyard, Coerced Confession, Grisly Spectacle, Ashiok, Nightmare Weaver, Mind Grind, Mirko Vosk, Mind Drinker, and Whispering Madness (only if combo with a deathcult rogue/Invisible Stalker)
Inexorable Tide might also be useful
I actually did search it up. Huh... some disturbing stuff mate.
No Sarkhan Vol?
Manabarbs it quite big for this kind of deck but it'd help a lot for mana spenders