Another vote for Counterspell. I also have psionic backlash (illithid) as reaction for both my PC and Shadowheart. It doesn't do much damage, but I love to see these 3 come in action together against the unfortunate spellcaster.
Spirit guardians is one that I use often. Lovely how you can damage the foe just by running around.
Summon elemental. The moment I get this spell at lvl 5, I cast it immediately after leaving camp as it stays up till next long rest. Very versatile weapon. For attacking, moving quickly over the battlefield and far or blocking a passage.
