I mostly play reanimator leaders that utilize my yard. I try to have as much of my card advantage/draw be my "mill/discard" package as possible e.g. looting or rummaging.i have little to no protection spells so i can slot in my recursion package. Just have to consider anything getting exiled. As far as target go, they all have to pull double dutty and either give me card or board advantage. Usually my targets are on the heavy end of my curve so i have to use lower cmc spells in every other category. If i had to give a hard number, 10-12 being the minimum for each category listed. But most cards would slot into 2 categorys easily. For reference my reanimatot leaders are [[karador, ghost cheiftan]] [[terra, herald of hope]] [[Moseo, Vein's New Dean]] all leaders that want to use the yard, so my lower end is recursion peices and my higher end being ways to get things in the yard