It was defined by two main elements
Once it does so, it stops being a copy of Me, so those counters will cease to exist when that card next changes zones
For many players, this is sufficient, and they can use index cards or other markers to separate their bulk cards by any category of their choosing (set or block of origin, color, card type, etc.)
Regarding reanimation spells, I feel Victimize is a must have since it's amazing value in a deck like this
Its a simple system, sure, but very effective in keeping you locked into the loop of spending your winnings on crafting and pulling cards so you can go back in to win more battles and thus win more rewards
This is helped by the common colors of Reanimator: White has lots of Exile permanent instants that cost 1 or 2 CMC, Black is the Queen of cheap removal, and Red can have surprising versatility early game