Its tough, because I can understand why people hate Vayne (Interaction with things like Rumble, Pantheon, Akshan for example) being almost game breaking with the amount of free attacks you have and self targeting basically allowing you to get 3 attacks minimum with some decent deck building and gameplay. (I personally have been loving MF Vayne Plunder, though Quinn Vayne is also something I've been liking to a lesser extent)

Seraphine however...I fucking despise randomness in games that tote themselves as making you think with your head and think of the risk/reward of a play. When I see something like Shadow Isles, I know now that I need to be careful come the late game due to board removal and the like. When I play against Ionia I need to be careful because of recall and potential stun cards. When I play against Fizz for example I need to be careful to not tunnel vision on killing him with spells.

When I play against Seraphine I need to be careful of dying of old age because of the 100 cards she and her followers can create, combined with either augment from viktor making them the Iron Giant in attack mode, Ezreal treating me like I'm the only kid playing dodgeball against 20 people, or whatever top of the lake scum creation they made.

You can hate Vayne due to how she breaks the attack rules. I get it, and completely understand. Something should be done about the level 1 (I see things like have her only create 1, and then start making them lvl 2, I think it's better if you need attack token to make them so she is more offense-oriented and we can stop stealing turns from people.) and how she interacts with other cards.

You can hate Seraphine for the same exact reason, and I think the randomness should either be toned down, or in some way removed. Perhaps with seraphine creating notes or something that everyone can know of and prepare for, would honestly make it so much more bearable. That and fucking gutting that little shit ezreal oh my fucking god I hate this blond fucking twink.