Effectively, this card is an inverse version of High Tide, which also sees a fair amount of play depending on the format
If you proliferate multiple times, you don't have to choose the same set of players and/or permanents to get additional counters each time
If you danced with calamity a little too closely, and the total mana value of the exiled cards is greater than 13, the cards you exiled will remain there and you won't get to cast any of them
If you want the read the entirety of the reserve list, you can find it here
While it is better to pay the one mana most of the time, sometimes you just can't if you want to make any kind of progress on your board state
The Lore points each location offers are collected at the start of the player's turn, with no need for questing