Well, here are some things gameplay-wise that Lure can do:

• Render all of the opponent's creatures useless for defence for a turn. It's almost a one-turn one-sided board wipe in regards to how it can enable an alpha strike against an opponent.

• Lure on a creature larger than any that your opponent has makes it pretty pointless for them to even play creatures unless they can deploy enough in one turn that their combined power can kill your creature. Even then, green has plenty of instant speed pump effects.

• Lure on a creature with deathtouch lets you kill at least one of your opponent's untapped creatures when you attack. If the Deathtouch creature has more than one power then it gets to kill multiple.

My guess is that effects like Lure rob opponents of opportunities to make calculated decisions with the resources that they have on board and that leads to more "feel bad" moments in a game. In a way, it's a bit more of a slap in the face than just killing their creature outright. Sure, you risk getting two-for-oned if the opponent destroys your enchanted creature before it can force blocks, but there will also be games where a large creature with hexproof or something gets the effect and prevents the opponent from ever building up a big enough board state to retaliate.

I assume that WotC sees Fight and Punch effect cards as a cleaner form of removal for green that is still creature dependent. They've tried to get creative though. I laughed the first time I saw the spoiler for Disturbed Slumber because whoever designed that card tried so hard to make a 2 mana, instant-speed, deal 4 damage spell while being constrained by Green's colour pie limitations. It's such a weird bundle of different effects in one card to try to get the desired outcome.

Prosperity is kind of tricky to use. X can't be greater than the number of cards in your deck if you don't want to deck yourself, so if an opponent happens to have more cards in their library than you it won't be possible to deck them out. You will have still drawn your deck so you'll have a way to win regardless, but your opponents now have most of their decks in hand too so they'll potentially be able to use interaction to stop whatever you do next. Since you've drawn all of your cards that means you'll lose on your next draw step and they might just get to untap and win on their turns. The best way you have to offset all of that is to have Jace, Wielder of Mysteries on the board. That way you can make sure that X is high enough that Prosperity decks everyone and you won't lose.

It will be funny if someone bounces or destroys Jace in response to you casting Prosperity though. At that point, I'm sure that your opponents would prefer to force a draw than just let you take the clean win.

I run Drown in Dreams as one of my X cost draw spells, but I also run spells that let me get cards back from my graveyard like Eternal Witness and Noxious Revival so I can squeeze a little extra value out of the card. There have been a number of times where I've targeted myself with both the card draw and mill parts of the spell because I was really digging for a combo piece and I had a card in hand that let me get something back from the graveyard. I could also use Drown in Dreams to beat all of my opponents too. With Zaxara out and a mana combo active I can draw my deck and mill out an opponent, cast Eternal Witness to get Drown in Dreams back, and then cast the spell again to force one opponent to draw out their deck while milling out my last opponent.

In terms of the flavour of each colours' mechanics:

Black doesn't care about the individuality or humanity of what it reanimates. The corpse is just a tool to use for the Black mage's goals. Black gets cheap reanimation effects because it doesn't care about bringing the person back to life, it just wants to get those bones moving. That's why a number of black's reanimation effects also make the creature a zombie when brought back from the graveyard or depict the creature being revived as a zombie in the artwork.

White's reanimation is framed either as the uplifting of the weak (characterized by generally limiting the reanimation target to things with a mana value of 2 or 3) or as some sort of grand miracle of revival that heals and gives a champion a second chance (See higher costed effects like Karmic Guide). It tries to convey a sense of faith that all will be well and people will endure.

Green generally returns cards back to the hand instead of the battlefield because it's framed more as a new member of a species taking the place of a dead one, like when a bear gets to take up the territory of another bear that has passed away. It's all about the cycle of nature continuing on. Even with cards like Reincarnation, the flavour is that one life was given up and a new one takes its place. Green doesn't care about a given individual, once a person's time is up then that's it. Their passing gives room for the growth of another.

Blue Sun's Zenith has performed well for me in my list. I use it as a secondary win condition if Thassa's OracleGC isn't an option for some reason. You can draw your deck with the Zenith and then it puts itself back as the only card in your library. You can then cast something like Gretchen Titchwillow or Spectral Sailor to draw it again. Cast the Zenith targeting an opponent to deck them out, put it back into your library, draw it again with your creature, rinse and repeat until you win.

I gave up on running cards like Exsanguinate or Villainous Wealth because they weren't that useful in the first few turns, while X cost draw spells at least helped me get closer to my combo pieces. If I did get my combo then the X cost draw spells essentially win the game for me as well, it just takes a few more steps to finish the game.

I was wondering what you usually use Whir of Invention to tutor up? I can see Midnight Clock as an option but almost all your other artifacts are mana rocks. You could run a cheaper spell like Nature's Lore instead if you are mostly using the Whir for ramping, or maybe the slot could be Blue Sun's Zenith if you want the slot to still be an X cost spell.