This is not a functional change
EDITOR'S NOTE : This article originally said that MtG Arena's matchmaking was "designed for players to have a 50/50 win-loss rate", which is a direct quote from the developers
With how sparse printings are for Mana Confluence, it is always going to have value, especially when it has the fancy Galaxy Foil treatment
There was of course rampant speculation about where, or why, this small fortune in retail product had been trashed
This is especially true in decks that have other uses for creatures outside of attacking, like sacrificing them or tapping them for mana with abilities like convoke
Thats not playable on its own, but maybe theres some sort of Affinity-pod brew that could go deep with Vedalken Engineer or powering Ornithopters into Wurmcoils