Mejai's in league is a snowball item that only gives damage, on characters who are squishy, and you can counterplay it by killing the buyer making them lose stacks.
Trophy collector has 0 counterplay, and gives you souls to buy items that make it harder for you to die, making it even easier to snowball
As for shadow weave and veil walker, they are invis items in a 3rd person moba with no wards. Lol