Champs that need 2/3 or whole team to freaking KILL

I might be dreaming but no, these Champs or mostly some of them need a whole freaking team to kill them.
Support Alistar? Really a support Alistar is already hard to kill by yourself. What if it was a top lane Alistar who was able to get more resource to get more gold and get tankier earlier than a support.
Nasus, literally takes no skill but rely on his unlimited stack to one shot a Champ (it ok if you suck at stacking because by 30min you will get at least 300stack which is basically what Nasus need to just kill someone). Let's put Octopus and Dog inside a cage together and see who win.
Anivia, you can't even trade knowing she have her passive, sure you can trade and turn her into an egg but when she come back to live full health you're kinda one shot to her.
Mundo, I don't think I need to explain.....or he wouldn't be ban all game and every game of my que
...............you know what, I'm tired Why don't you all just find out yourself playing against these Champ 1v1 If you win, you must had play with someone bad seriously
OK I'M READY FOR ALL THE HATES COMING AT ME LET'S GO