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
All four of these cards look like potential fits for an aggressive-ish black deck
We're trying to play at the casual table after all
On the third turn, youll have a mind-boggling 2059 nonlegendary copies of Adrix and Nev out on the battlefield, all of which have haste, which should be more than enough damage to take out all your opponents in one fell swing
Throw in a bunch of small creatures or some way to produce a lot of token creatures, and you'll give them all a massive boost in power with Graaz in play
You can tap them to create a Disenchant, Braingeyser, Terroir, Shivan Dragon, Regrowth, or Black Lotus, and then you can cast it, but you have to pay the cost for it