Honestly, I don't think it constrains the rest of your options that much!
Sure, there's a spectrum of power level changes from "too much" to "not much":
Sparksmith gets even dumber
Gempalm Incinerator becomes very good
Elvish Champion isn't really that much above where it's usually at when you're playing it in your deck anyway.
Lightning Bolt doesn't care
If that makes sense? With
Lord of Atlantis being a notable exception, almost every lord-creature was 3+ mana -
Eladamri, Lord of Leaves doesn't murder them instantly - so while the morphs are better and you get more creature-types-matter than usual, it doesn't really do anything tooooo stupid. Maybe
Dragonspeaker Shaman lets you do something filthy with some kind of
Mana Echoes or something?
Coat of Arms and
Cryptic Gateway get more interesting when morphs enable them, you're already spending a jillion mana... I think it's a net benefit.
