Here's my take on what's good and fun – they may not be stellar choices, but they'll be funny cards.

1. Akuta, Born of Ash – black should be pretty good at wisdom – since you'd likely be whacking your opponent for his cards to gain card advantage – its that simple. 4 to cast 3/2 – not too bad for a recurring creature.
2. Ayumi, the Last Visitor – 5 to cast 7/3 – with legendary landwalk – its 3 toughness makes it hard to burn with Shock, but the legendary landwalk makes it valuable in Standard – being low cost – soul shifting this is also good.
3. Blood Clock – are you thinking what I'm thinking? Control the board!
4. Kirin – I believe most of the Kirin are really good things to play – always play an expensive spirit spell. *grins evilly*
5. Captive Flame – Firebreathing across the board is never bad.
6. Charge Across the Araba – Game ender – proves that red isn't the only one who can sacrifice lands for damage!
7. Choice of Damnations – This, I suspect – is gonna cost hell of a lot – it's 6 to cast – and at that kind of late game, it's likely to end it also.
8. Dense Canopy – Turn flying into shadow (hehehehehehe…)!
9. Descendant of Masumaro – This is a funny card that can grow or shrink – but while the ability is green, you cannot play a monogreen and expect this to grow – it's a card you have to play in combination with other cards to gain supreme advantage.
10. Elder Pine of Jukai – More and more mana acceleration is in Kamigawa – which leads me to believe Ravnica is going to use some of this madness.
11. Enduring Ideal – Hondens, anyone?
12. Eternal Dominion – What's more fun than taking your opponent's stuff to use as your own? Owning him in Magic by doing nothing but that.
13. Evermind – seems useless? two mana per card per spirit or arcane spell isn't bad – plus, it adds to wisdom!
14. Feral Lightning – Expensive – but helpful once you've slaughtered everything else!
15. Footsteps of the Goryo – Reanimate something that does something useful when it lives, or when it dies. A Legendary Dragon Spirit would be fine.
16. Gaze of Adamaro – How else would you deal with a wisdom based opponent who has card advantage?
17. Ghost-Lit Redeemer, Ghost-Lit Stalker – 'nuff said!
18. Glitterfang – Spirit spell that stays to trigger spiritcraft for as long as you like… (I'm thinking Evermind…)
19. Gnat Miser – *grins evilly* What about taking away your opponent's wisdom?
20. Hand of Cruelty – get this if you play black – undeniably useful.
21. Hidetsugu’s Second Rite – a burn spell that is truly value for mana.
22. Homura, Human Ascendant – play it, kill it – have fun with your 6/4 flying Viashino Sandstalker or 3/3 Glitterfang.
23. Ideas Unbound – looking for one card? This is what you need.
24. Iname as One – nearly not usable, but adds to the cool factor when you win with it.
25. Kaho, Minamo Historian – I can't stress more how useful this is in games – so I won't.
26. Kataki, War’s Wage – see that annoying Jitte? Make him pay for it!
27. Kiku’s Shadow – not completely useful, not completely useless.
28. Locust Miser – make life more difficult, shrink your opponent's hand.
29. Manriki-Gusari – hate equipment (thinks Jitte) – kill it!
30. Measure of Wickedness – bored? Play this and have fun!
31. Michiko Konda, Truth Seeker – seek the truth – and kill weenies and blasters.
32. Murmurs from Beyond – How to get what your opponent's think you don't need… *grins*
33. One with Nothing – What's this for? Many people can argue this out for years. I'd say – seek and ye shall find!
34. Oppressive Will – Card advantage = Blue, Counterspell = Blue, Card advantage dependent couterspell = Genius
35. Overwhelming Intellect – Saw that Iname As One? Wanna get something from it?
36. Pain’s Reward – you willing to pay for four cards? Go ahead! I dare you.
37. Pithing Needle – anti Ravager – but that's not around anymore now, is it?
38. Promise of Bunrei – creature generation
39. Promised Kannushi – Something you play to kill, and get something better back.
40. Reverence – Rever me – or actually…
41. Sakashima the Impostor – mirroring was never this flexible
42. Sakura-Tribe Scout – no comment needed
43. Seek the Horizon – I seek land, so give it to me!
44. Sekki, Seasons’ Guide – chase this card to the depths of the ocean, 8 to cast 8/8 annoyance.
45. Twincast – What could be better than to double your take?