I'm thinking about attempting legends next month and wondering if there is a certain champions I should use, and does it have to be on certain mode like heroic or master?
No offense, but judging from your general account progression and posts on the forums, I don't think you're anywhere close to be able to do a legends run. It's mostly for endgame players who want some fun. You'd basically need a 6* r2 corvus or higher and quite a few units to even have a shot. The rewards aren't good, because it's not really meant to be done by progressing players.
Going through your profile, it seems you’re on or have only recently completed act 4. Unless you have a 5/65 Corvus Glaive (arguably the best option) , max suicides and preferably a newer apple device, there’s no hope at all unfortunately. There’s other requirements too but those are the main ones.
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There’s other requirements too but those are the main ones.