its like the boss shrines but it gives you the luck effect if your lucky if your not you get the unlucky effect but doing this shrine requires expensive materials (use ancient debris for it to be more useful)
here are some thing when you are unlucky:
natural loot and not opened loot aka randomly generated loot will give you bad things
villager trades are more expensive
higher chance of zombie sieges
mob drops are very very low
mobs have better gear than before
well any thing the devs can think for the player to be unlucky

when you are lucky:
you gain better loot
mob drops are high
villagers trade are a bit lower
anything the devs can think of



this may add a bit of shrine stuff to the game and making it more intresting than before




p.s this may be the baddest idea i might have thought of