@d4sy92120
Doubling season would work fine, yes, but it's out of budget compared to the rest of the deck.
Hmm.. about your mana base: I think the most important thing is that you're able to play your commander at turn 4, better already at turn 3. So it would be good to have some more cheap mana ramp/fixing.
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Ash Barrens: Compared to
Evolving Wilds, I think Ash is better after turn 1. for both you pay 1 mana, but you can play Ash just as another colorless land later on, if you've got enough colored mana.
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Rampant Growth: you just get 1 land out of it, but the
jump from 2 to 3 mana is a little more important than 3 to 4. besides that, it allows you to fetch your missing color.
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Fellwar Stone: Same as
Exotic Orchard but as artifact. You're a little dependant on your opponents, but in a multiplayer game, this shouldn't be a that big disadvantage.
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Nature's Lore: until now, you're just able to draw basic forests with it, but if you upgrade your mana base in the future, it also works with cards like
Overgrown Tomb. For the more afordable battle lands like
Canopy Vista, you've got the wrong color combination, in order to tutor with
Nature's Lore for them.
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Llanowar Elves and
Elvish Mystic: Those two only tap for G, but they can be played at turn 1, and help you getting some more mana for X spells.
Since you'll need some space, some cards I would cut:
Cold-Eyed Selkie: he's fine, but to be efficient, he's better in a deck where you can push him.
Shriekmaw: I think he's a bad removal unless you've got a graveyard focused deck, which allows you to abuse him
Illusory Ambusher: Interesting idea, but the problem is that you usually have to keep 5 mana open and wait for your opponents to attack
Kiora's Follower: He "just" allows you to get 2 more mana, unless I've missed something, since you can't unap him. The other 2 endless mana Cards can also be applied to your commander directly for infinite mana
Yavimaya Dryad:
Rampant Growth does the same and is cheaper.
Urborg Elf: 2 mana elf, but provides you all colors you'll need
Since your gameplan includes much big creatures, you could also add some other draw spells:
Life's LegacyReturn of the WildspeakerRishkar's ExpertiseSoul's MajestyHunter's Insight (important here: choose also works on creatures with hexproof/shroud)
Snake UmbraAbout
Simic Ascendancy: It's a wincon, yes, but nothing that says "I win now". First of all you'll need to get 20 counters which means 22+x available mana if you want to play and fill it at once, and even then, you win at your next upkeep. This means your opponents still got a turn to solve this problem. So thats, at least for me, fine for a kitchen table round.
Besides that, you've got no tutors, so you can't even rely on getting your hands on it.
Kiora, Behemoth Beckoner could also be replaced with
Colossal Majesty. You can't use it for untapping creatures, but it's a little harder to remove.
What also catches my eye while looking for cards was
Lifeblood Hydra. It may be a little expensive, but could be very interesting, since it's a X creature and also provides alot of card draw and life.
Brawn may also be interesting, if your group lacks grave hate.