Idk but if they are working with the bloodwell thing, there should be one who can target an enemy champion and make their mana costs turn into health costs as well.
Another should, at 20% of his health, split into 2 champions sharing that 20% of their max health and be able to fight (Like shaco and his clone) until one dies, then they both die. This should be a ranged carry.
The third should work off of sustain through fighting and be a mage. When below 50% health, health costs actually become health gains, so they heal while casting.
The fourth should be a support who could bond himself to the enemy. If he dies, he gives 50% of damage done to him while tethered to the target.