There is a reason why thunder lord's decree appears so often...

with the nerf its more balanced now. aka less oppressive early. but with its changes and the keystone changes in 6.1 and 6.2 to the other keystones. thunderlords is a good all around pick but some champs have better options. like ez thunderlords or ferver same for jinx. mages now need to pick. i go with deathfire now on ori instead of thunderlords. etc.

tl:dr thunderlords is good most places but is no longer the best pick op all champs.