How do you get legendary skins easily

I am missing two skins; Unicorn and Ancient Warrior, do you guys have any strategies to getting them? I have 85,000 coins laying around if that helps.

iron crates and beg for legendary skin to come

Are you sure? Ive been told suplly crates are better, and i got 2 legendaries from them but nothing from iron

i got more 2 legendarys in a row and give a chance of more better skins than supply
crates

i got 2 legendary skins from the same supply crate

Sameā€¦

also answer:
you dont

I got dragon and phoenix from one crate