Dumbledore's life-debt?

[A.E.B.Bevan at open.ac.uk]

No: HPFGUIDX 29123

While we are onto associations with Geomancy I note that a standard 
work on this subject is by Agrippa. 

Now 'Agrippa' is one of only two Chocolate Frog cards Ron hasn't 
found yet from his collection. Wonder if the information on 
the 'Frog' Card about Agrippa will trigger of some plot action in a 
later story? 

Now what was the other card Ron didnt have?

Or we could all be chasing up the gumtree.... 

Edis