Heard awhile back that Battlefield conditions are unique,even tho reprinted. Like that ya cant use 2 ordinary days in a tournamet...even if it is 1 from legacy and 1 from icons. Is this true?

Yes. From the general errata:

Battlefield Condition cards are considered “unique by name”. If Battlefield Condition cards with the same name appear in multiple sets, a player may only use one copy of any named card in his hand during a tournament (see also the HeroClix Comprehensive Tournament Rules).