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no doubt it'd be broken, but legacy has the same gy hate available as vintage. Leyline hits just as hard coming from 1.5 as it does from vintage.

nah, gy hate is just as strong in legacy as vintage, and maybe even more prominent.

Oath is probably best since it would have less chance to die to oops all cheese and other t0 wins. I'd personally play 4 top predict miracles just to trigger legacy players PTSD