That being largely a matter of "these seem interesting, but likely won't see play unless the right deck comes around." There're a few exceptions, which I'll touch on, but to save you, the reader, your sanity by not reading the same line over and over across 20-30 cards, I'm going to talk about them mainly in groups here and now
Anytime anyone sacrifices any creatures for any reason, Thraximundar gets +1/+1
The second ability applies only as blockers are declared
It is also BFFs with spellslinger strategies
You can grab a Set Booster box for around $124, which is honestly less than I paid when I pre-ordered it a week ago (goes to show you that preordering is a risky bet)
And here's what happens, once you start drawing from this, your foe's will be like, "Well, they're already drawing from others, so I shouldn't worry about it and pay the tax." And then you draw more