Ramos Lucky Charms Ramos, Dragon Engine is a Multicolor Matters deck that rewards you for casting multicolored spells by growing into an evasive 1-shotter that also skyrockets your mana, giving you a whopping 10 mana whenever you activate his (very easy) ability
Modular Monstrosity What keywords am I allowed to choose
These are much weaker than the curses we typically see now (Curse of Disturbance just straight-up outclasses Curse of Shallow Graves)
Tyranid Invasion is great early (since you usually have three opponents), Tyranid Prime is absolutely bonkers, one of the best cards in the deck, and Tyrant Guard is pretty good, offering protection to your board
In general, players don't like downside mechanics unless they're especially flavorful, and echo is about as unflavorful as it gets
I get that they are a huge card company, but seems like they are the only company Ive ever seen plagued with this kind of issue