In my opinion with the worlds mission there are a bunch of problems. First of all, i know that riot needs to make money (and i can talk of other f2p games that are better on free things, but idk if i can talk of them in this forum), but i think it's really wrong that i can't reach the last reward without paying, why don't just put it in the master pack?
but that's a little problem, the main one is
PRINCIPLE #1: Missions don't troll you games
Bad mission: win a game with 300 ad as Lux
and now we have: Win with no ranged champion and Win with all the players with teleport?!?! (and for only 10 coins) riot is kidding or just dumb?
(and seriously? no feedback section on the forum?)