so i have already quit the game after hitting masters euw.
1. if i remember right, u will lose daisy if summoned inside morde ult and the morde ult ends. and when morde R u while u still have daisy following u i think daisy will stay outside until morde ult ends. How do u deal with morde? well he cant activate his passive by smacking daisy so u just E daisy and camp in bushes so daisy gets bonus dmg and daisy easily cheeses morde just keep ur distance.
2. There is some champs that can eat ur daisy or throw it away like cho and sion. And some that can just all in u under the turret like volibear. Or tanks that focus on mr build and heal back full hp like mundo. I do not know the meta nowadays but if i remember right those champs gave me hard time back when i still played the game.
3. Yeah i think like ad bruisers are the best with ivern. Ideally i would go with some damage dealing ad champ and keeping him alive with E. As you are ivern top, your team usually lacks frontline champs so i liked to play with ad bruiser junglers. I think its worse if ur jungler is ap, then ur enemy can just buy mr and tank you and your jungler. And ofc if u have fed adc or fed yi or something like that, you want to focus on keeping him alive in fights and win the game.
4. You will deal massive ap damage. Ur shields exploding, daisy, ur Q and bonus magical dmg from bushes. But I still recommend to get atleast 1 other ap teammate in ur team like ap support.

I have 3 Questions:
1. What about Mordekaiser Matchup cant he just R you and your a silly little tree without your girl? How does it work with Summoning daisy inside does she stay there?
2. What types of champs does Ivern wanna play against? Im guessing non-tanks if possible?
3 What types of champs does Ivern wanna play with? Im guessing at least 1 melee? or many melees? Like Xin Jarven Olaf?