working on standard deck, looking for some cards

I'm working on a new standard deck and need the following

invisable stalker- 3
talrand- 3
steam vents- 2
watery grave- 3
drowned catacomb- 2
whispering madness- 1
duckmantle seer -3
snapcaster-1

feel free to purpose a trade. I would be willing to trade a cavern of souls for a snapcaster if that's of interest to anyone.
I ma consider offering cash for some of these cards but I would only pay probably 25% of their value in cash as I'd rather trade for them