I think I'd settle for any kind of
Buried Alive port. And anything else from there which isn't too much hassle. I kinda threw the stuff out there in case it points you in a direction when you have several to pick from.
As for mechanics - flip cards (the rather basic ones) would be really nice, and arcane spells whenever you get to them. Even the lame / mundane looking ones.* Especially those, in fact -
- | Open
- Kodama's Reach (!!!) - spiritcraft friendly ramp
Lava Spike (!!!) - used in multi-format burn
Crack the Earth (!!!) - I want it for myself with Akki Blizzard-Herder cheeze
Eye of Nowhere (!!!) - land bounce deck staple + spiritcraft triggers
Reach Through Mists (!!!) - great card in the right deck + sc trigg
Rend Flesh (!!!) - black spirit staple, kick-ass card
Footsteps of the Goryo
Otherworldly Journey (!!!) - +1/+1 flicker, what's not to like
Terashi's Verdict - sc friendly kill
Peer Through Depths
Swallowing Plague - really good, nicely balanced card for low lives decks
First Volley - same
Crushing Pain - rather cool to give the AI
Terashi's Grasp - lovely
Toils of Night and Day
Waking Nightmare (!!!) - nice, standard discard with sc trigger
Path of Anger's Flame
Unearthly Blizzard - win card
Unchecked Growth (!!!) - green spirit staple
Terashi's Cry - win card
Blind with Anger - spirit friendly threaten
Sunder from Within
Joyous Respite
Uproot
Ribbons of the Reikai
Call for Blood
Death of a Thousand Stings (!!!) - cool slow stinger mana sink
Feast of Worms
Three Tragedies
Pull Under
Are mostly pretty banal, except they are needed in semi-stable low power decks where they're supposed to trigger various spiritcraft triggers or interact with Spirits. A rather simple example is
Loam Dweller being uncommon mostly because he combos with
Kodama's Reach. You cast him turn 2, and you get to put both lands into play turn 3. Also, some of these are perfectly playable in regular decks, and even used in those. Like
Lava Spike . I even left a bunch out, and the ones with little !!! next to them are particularly noteworthy.
So if there's a way to get, say, that bunch in without really having to bust your ass when Splice comes in, it'd be really nice.
I'm honestly less interested in arcane cards with splice than just these regular ones, to compliment a bunch of stuff that's allready in.
And again, that's just nudging, you do your thing.
Oh, one more, minor seeming, reason is that they're a bunch of simple spells which have artworks that mesh well with Khans Block, Portal 3 kingdoms and Kamigawa aesthetically. Having them handy makes making use of the other stuff from those blocks easier to do in ways which don't poke the eye.
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Oh, and not sure where you are with cycling cards, but I hope the cycling lands are getting in. I'm really curious as to how the AI handles those, and looking forward to sticking them everywhere if it's not artrocious.
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*I wanted to add something to this that's not exactly obvious but I don't want it to feel like badgering you. It's argumentation which I feel like should be there, and still don't feel like you have to do anything because there's some argumentation.
I don't know how far away splice in particular is, could be god knows how far away. Considering how different it is from everything else, might be never for all I know. What's more, once it's in, god alone knows how the AI will handle it. Madness is in, but there doesn't seem to be a way to give it to the AI. That's kinda the important bit - waiting on splice to get arcane at all is very annoying since the basic arcane cards could be used right away, while whether any splicing ever gets done by the AI can easily end up out of anyone's hands.