If you notice black decks keep doing well and red decks seem to struggle, swap out some of the weaker red cards for stronger options, and nerf the black archetypes, for example
Compared to similar creatures, while it has no guarantee if it misses, it mills one extra card and also has a bonus in town
Lore, symbolised by the weighted diamonds (present in the O of Lorcana), is gained by exerting the character
It might be worth it to invest in a sealed Collectors Edition or International Edition box and sit on it if you find yourself with $25,000 to blow on Magic someday
HeiHei allows an opposing item to remain exerted, so any item that has to exert itself for its effect would not be able to be used
That said, Tarkir: Dragonstorm gave us a large number of Abzan cards, with a notable subset that leans heavily into toughness-matters strategies