About: http://webisa.webdatacommons.org/37169113

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	As others have said, float generally means produce mana I am not using right now, for example if you are tapping something that produces four mana and only using two of it on the current spell.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com