This is the stupidest function in game. Basically you spend your coins to lose your coins. The teams you get set up against are IMPOSSIBLE to beat. I have fully cleared crucible for six months with garrick,zem,rylie,Jasmine,fiora with out a hitch. But im lucky to do 1/20th of the opposing teams hp in damage. Plundering used to be fun but when the update came out that matched you against immpossible teams it lost its appeal REAL fast ive sat at max rolls for months thought i would try it again with this "lose three times more coins aytempting our impossible plundering event". Turns out its just as frustrating and stupid as it was 6 months ago. The only viable way to keep this TERRIBLE function in the game is make it free to plunder so we can at least just die for free instead of paying 90k coins to die 20-100 times in a row.
Or just make it so you can exchange rolls for 5 coins each that way you get something out of it.