At the beginning of your upkeep you gain {C} for each creature you control named Oodvar of the grand multiplicity. You don't lose this mana as phases end this turn.

You may have up to ten creatures named Oodvar, of the grand multiplicity in your library.

If you control another creature named Oodvar, of the grand multiplicity when you cast this spell this creature loses its legendary type and the following abilities:

Hexproof

{5}{U}, {T}: Return target creature named Oodvar, of the grand multiplicity from your graveyard to the battlefield.