Because damage remains marked on a creature until the cleanup step or an effect removes that damage, nonlethal damage dealt to a creature may become lethal if you switch its power and toughness during that turn
The actual definition of what it means to mill a card is to put the top card of your library into your graveyard
Plus, if it dies, you get to make a lot of Treasure, even helping you cast the next one at a larger size
An entire deck filled with these turns Eivor into a Fireball before it even picks up a Bone Saw
I like these sets, as Magic players are usually gamers and will be playing other franchises
Do the ultimate ability of Teferi, Master of Time to win in one fell swoop with this creature in which you have gained control, so you dont have to wait for the full turn cycles to claim victory