This copy effect ends up being expensive to use in comparison to the other options that this deck has, and was later replaced for cards that create a ton of value with the final gameplan that was landed on
Some decks like Temur Rhinos play Force of Negation in the maindeck, but most opt to play it in the Sideboard and bring it in when it shines
Finally, I'll point out that Marneus, Alela, and Raffine all also play into an Esper sub-theme that may be subtle, but is definitely powerful: aggro-tempo
Many of the strongest green spells are widely printed and accessible
As soon as they announced convoke as the returning mechanic it should have been clear as day that we were getting Chord
What is important here is not the absolute value, that can be influenced by several factors (humidity, characteristics of the scale, etc) but the fact that 2 cards of the same set should have the same weight