[[Quenchable Fire]] will deal damage every turn after it is cast until the mana is payed to stop it, rather than just once during the next upkeep.
#Quenchable Fire
vale sun
outer escarpBOT
Sorcery
Quenchable Fire deals 3 damage to target player or planeswalker. It deals an additional 3 damage to that player or planeswalker at the beginning of your next upkeep step unless that player or that planeswalker's controller pays 
before that step.
You'd better know how to pray for rain.