I agree, i think that in tmdc, it should be no cooldown, but on tmd-pvp it should be cooldown. This is coming from a Mythical, so this isn't out of self interest. Its out of making the game more fun.
Absolutely keep 'em. Getting rid off infinite was necessary but tweaking legendaries availability was also needed. We can't have a functional economy if rankeds are gods between regular players.
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