I think
Sylvan Safekeeper is better than Ascetism since it can be tutored, not to mention that it's cheaper,
Lightning Greaves are great too. You could also add
Ramunap Excavator since it comboes off with Azusa and
Strip Mine /
Wooded Foothills and is tutorabel unlike Crucible. You should also replace all the
Cultivate type cards with
Gaea's Bounty,
Journey of Discovery,
Seek the Horizon,
Krosan Tusker and
Nissa, Vastwood Seer since they have more sinergy with Azusa.
Gauntlet of Power and/or
Caged Sun could be replaced by
The Immortal Sun (new card) as it seems better overall.
Elemental Bond or
Garruk's Packleader seem definitely more consistent than
Glimpse of Nature.
Realms Uncharted can replace
Harrow so you can get
Strip Mine ready to combo off with Crucible/
Ramunap Excavator.
Momentous Fall is not bad, but it's much worse than
Greater Good.
Harmonize is a must in every green deck and you should have it. As an anti-flyer creature other than
Arbor Colossus (which isn't bad), i would consider either
Cloudthresher or
Hornet Queen, which comboes off with
Craterhoof Behemoth.
Borderland Ranger should be replaced with
Expedition Map, which can get you the coveted
Strip Mine for the combo, or even
Gaea's Cradle or
Ancient Tomb (which you should have) for more overall mana.
Elvish Piper is fine imo, it basically gives your creature f1ash and uncounterable for 1 mana, all things that can screw up your blue opponents and is almost always a must-counter card, i'd say
Quicksilver Amulet could be better since it's harder to kill, but it costs more to activate, so it's up to you.
Melira, Sylvok Outcast seems like a wasted slot, since it doesn't combo with anything in the deck, unless you add
Altar of Dementia or
Ashnod's Altar then it comboes with
Woodfall Primus.
Chord of Calling is much better than
Mwonvuli Beast Tracker since it's instant, it doesn't make card disadvantage and it doesn't have restrictions.
Vengevine is too weak imo, i'd rather run
Genesis and add
Survival of the Fittest to combo off with it. Replace
Vorapede with
Carnage Tyrant: much better. I would consider
Steel Hellkite over
Wurmcoil Engine: Wurmcoil is not bad, but it's a defensive card that you don't really need imo, and offensively it's a 6/6 without trample, Hellkite has a much greater offensive presence, and flying which could help to
fend off flyers if needed. Yeva is fine, but i would also consider either
Dosan the Falling Leaf or
Prowling Serpopard as anti-counter cards.
Thaumatic Compass can help you ramp early game and then
fend off annoying creatures, like commanders with equipments.
Beast Within i think is a must have in every green edh deck.
Courser of Kruphix is another must have for Azusa.
Duplicant is a nice removal card, expensive, but tutorable. Since it recently got unbanned, i would consider
Protean Hulk, maybe to combo off with something like
High Market and
Greater Good, or just as wrath scare off.
Horn of Greed and
Tireless Tracker are other must have in Azusa decks imo. Since i can see you like your tutors ( as i do) you might consider
Woodland Bellower, it's not super good, but it can tutor for some good cards like
Eternal Witness,
Ramunap Excavator or
Reclamation Sage (which could replace
acidic slime for the sinergy with Bellower).
Nissa, Vital Force is pretty good, it can ultimate early game ftw or give you a
eternal witness-like effect late game.