I'd talk to Scott Mosser, who runs a Facebook page for signed cards, in case you're on the hunt for Harold
Finally, one last aspect of the system I want to cover is the actual scanning process
If Lathril deals 2 damage, Marwyn, the Nurterer and Elvish Archdruid now add 2 more mana
Top Five Mega Evolution Cards M Gengar EX (XY Phantom Forces 121) The XY era is often remembered for its darker, more atmospheric art direction, and nothing captures that goth phase better than the Secret Rare Mega Gengar EX
Then I can check for overlaps of 2 (or if the rest of the sheet is nearly complete I sometimes only go with 1) and assemble the complete sequence
The next candidate is coupling with white or red and using the token droppers available in those colors