About: http://webisa.webdatacommons.org/237408222

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Card types such as artifact can not be chosen.5/1/2012: The spell can not be countered if the mana produced by Cavern of Souls is spent to cover any cost of the spell, even an additional cost such as a kicker cost.
http://www.w3.org/ns/prov#wasQuotedFrom	magiccards.info