Apologies in advance if this topic is something we've discussed before but I couldn't figure out any good searches to find out.
On to the topic itself: what cards do you think used to be really popular but aren't that popular anymore?
OP starts:
Mind's Eye used to be a staple in many decks. It draws a decent amount of cards but the downside is that it is expensive to cast, does nothing when it comes in and requires surprising amounts of mana to use properly. Since curves have become leaner it's just prohibitively mana hungry and has been replaced with cheap stuff like
Esper Sentinel or burst draw that gets you going right now instead of tomorrow or the day after.