My opinion on why Standard has been stale over the last few years is because there have been a small number of cards that have been much better than the rest of the card pool, which means you had to play them
Are these cards "good" cards
Hermes, Overseer of Elpis Hermes, Overseer of Elpis wants to cast certain spells and keep at least one bird on your side of the battlefield, so scry 2 each turn makes this wizard self-sufficient
Its no surprise that in Rise of the Floodborn we get to see even more of these imaginative redesigns
Ellywick Tumblestrum Let's be honest
In the end, it probably doesnt really hurt your mana base, since you can always give it up for Treasure, and in the later part of the game you might be able to make some really silly amount of treasure, which might be nice if you have a mana sink of some kind