Counterspell: not to pile on, because I actually kind of like the concept. But it just lacks pizzazz. It's boring. I want an epic spell dual with real risk, not a flick of the wrist.
Heat metal: have someone with this? Never have the big bad wear metal armor. Want to nerf the one guy that dares to run a tank in armor? Give this to the enemy. One of the few spells I've rewritten or banned.
Two (three? Way tie for third)
Teleportation (including teleportation circle):. Want to set up an epic arc traveling across dangerous pirate filled seas, fleeing from powerful enemies? Too bad! The group just teleports. Poof! they're there. No clue where "there" is? No problem! The princess you're escorting still has a note that was written at the location so you have "an associated object"!
Teleportation circle is almost as bad.
Banishment: Oh no! A demon is attacking and is about to kill innocents in order to get to the king! As DM I chuckle to myself thinking of the challenging encounter that's not just a straight up fight I just set up when ... wait for it ... the dreaded "Make a charisma save" are uttered. Usually along with the divination wizard telling you your Balor just rolled a 1. So long big bad!
Honorable mention goes to plane shift, but it's really the same issue I have with teleport. Want to get past Heimdal and crash Thor's surprise birthday party? Just plane shift to Valhalla!
Heat metal: have someone with this? Never have the big bad wear metal armor. Want to nerf the one guy that dares to run a tank in armor? Give this to the enemy. One of the few spells I've rewritten or banned.
Two (three? Way tie for third)
Teleportation (including teleportation circle):. Want to set up an epic arc traveling across dangerous pirate filled seas, fleeing from powerful enemies? Too bad! The group just teleports. Poof! they're there. No clue where "there" is? No problem! The princess you're escorting still has a note that was written at the location so you have "an associated object"!

Banishment: Oh no! A demon is attacking and is about to kill innocents in order to get to the king! As DM I chuckle to myself thinking of the challenging encounter that's not just a straight up fight I just set up when ... wait for it ... the dreaded "Make a charisma save" are uttered. Usually along with the divination wizard telling you your Balor just rolled a 1. So long big bad!
Honorable mention goes to plane shift, but it's really the same issue I have with teleport. Want to get past Heimdal and crash Thor's surprise birthday party? Just plane shift to Valhalla!