when I first saw this card I did wonder why it's
?
As to name, well, perhaps not that suitable for elements, although given some of the names I've come up with it would be hypocritical for me to complain! All it would need though is to be called something like 'venomous extraction' which is where you magically, as an elemental, extract the poison from the creature kinda thing...
As to mechanic/idea, really like it!
It's got me thinking about a general card which could 'suck out'(i.e. copy and put into a vial) the essence of a card, like Jappert already mentioned. Could get a Freeze vial from arctic squid (basically a freeze spell) or heal from guardian angle, plus the poison as you mentioned etc.
I do think it works best as an idea with the poison though, as you have it. And perhaps best leave it at that, just throwing some ideas out there!
One last idea I'll put out there is, as it extracts something from the creature (espec if more magically rather than syringical) it could also give the creature -1HP. Since it would most likely be your creature, this could be an extra price, and also keep cost of spell down (if need be :s). Not sure if that'd be better, just a thought...