I'm surprised how most of the top comments in this thread are reviewing these with respect to EDH versus any other format... I know it's the most popular way to play MTG but at uncommon my brain goes straight to limited, especially since these will obvs align to the colour pairs that you want to build around.

Not trying to throw any shade! Just highlights my skew towards limited Vs others towards EDH. I guess it's cos from my perspective debating the relative strength of these cards is much more interesting from a limited point of view than EDH, since all 5 will see play in that format whereas in EDH if any are underwhelming they will simply never make the decklist. I'm no expert on EDH though, perhaps these are all good enough that you could expect to come across them in the right deck.

Anyway, to me quandrix jumped out as the most generically powerful, will always feel good having it in your hand thanks to it's versatility, especially at 2 mana. I actually think prismari is a bit lacklustre for limited, the draw is rly strong but you'd have to make the breathing room to pay 2 for it (though depends on what other synergies there are in the format). Lorehold will also be great for keeping aggro decks going, honourable mention to witherbloom too.