Ovelia, having never had any freedom or happiness in life, is wounded by Delita in self defense due to her becoming paranoid that he'd discard her just like he discarded everyone else in his life who was no longer useful to him leading her to stab him
Essentially, if you have a full party with all four of these on the board, you can pay one white, one blue, and one black mana to give the Warrior lifelink, deathtouch, and make him unblockable (deathtouch and unblockable at the same time has no real use, but thats still OP to think about)
It's Unpreventable Just like a mob boss who bribes the cops to look the other way, some cards just ignore all the rules
I have a general system for buying cards, it goes as follows: My system is solid and brings me great turnaround sales every week