While restrictions do breed creativity, it's fun every once in a while to just do things you're not normally allowed to do
Elvish Piper is superior because you can cheat your creatures out at instant speed and not just during your attack phase, plus it doesn't become exerted, but at least the champ saves you the mana cost to activate
If you're a data hound who wants metagame research , MTGGoldfish is indispensable for tournament results and price trends, even if you never touch its deck builder
Oko is also a breakpoint for this ranking
I have mixed feelings about Mob Rule since on one hand, it looks insane, but on the onother, in a heavy morph/manifest format, it's going to be hard to make a huge momentum swing since the opponent will probably have a mix of creatures over and under 3 power