There are certainly some themes present in this expansion, but because of the sixteen games in the series, it feels like the cards are all designed to do various weird and unique things, at the cost of them being rather weak in power level
If you don't like Swarmyard Massacre for relying too heavily on having an army of tokens around, try Kindred Dominance for a guaranteed one-sided board sweep
These are examples of generically powerful cards that work in multiple archetypes
Hullbreaker Horror Hullbreaker Horror is a game-ender
In the recently released return to the beloved Tarkir, Sultai has a theme of caring when things leave your graveyard
Galadriel's Dismissal rounds out these effects, flexing between a single-target protection spell and saving your entire board, depending on what you need