Absolutely right - Ami Monument and Enlightment deserves nerf. These cards shouldn’t be deleted from the game completely, because it's always bad to cut off existing strategies from the game.
Mb Devs should add temporary option for Amii monument - for example:
It gives orb only for 20 seconds. Charge time is 60 seconds. No void power back. Only one for map is available.
Or just make it cost more. Last option isn’t interesting though. I think Devs as professional players can come up with better ideas.
Same for Cursed Well 15 energy loose vs 100 and +1. Very lame.
Many cards require rebalance - for example Shadow and LS has a lot of OP cards, while Nature really suffers in PvP in T1 (that was my main reason to leave old BF). T2 is balanced better, I admit. Shadow has some OP cards for PvE too - everyone knows them. This faction idea was to be risky but in fact it's the easiest, even newbie player with some experience in RTS can notice that's "risking" shadow cards are easier to play. In the meantime real risk is Nature and Frost t1 in PvP. In PvE Shadow has so many options too and LSS was designed by Phenomics only for more microtransactions.
Game balance between cards was designed very badly. I know - there is no chance to make game absolutely balanced, especially cards based game, but now it's very far away from OP Protoss Fleet balance in SC2.