I have a whole-ass (private) trello for this exact stuff so here is a few small ones TL;DR’d
Nexus Refraction
+
+ 
Creates an area that causes deadly reflections of light that have the piercing capabilities of a bullet.
The Great Plague
+
+ 
Creates a massive, green cloud of powerful bio-weapons that shreds the HP of anyone inside of it
Bubble Link
+ 
Creates bubbles of magic in the surrounding area, anyone hit by these bubbles take a decent portion of damage
Supermassive Black Hole
+ (Darkness)
Creates a black hole that sucks in anything nearby, anyone trapped in the black hole takes continuous damage
Ultra White Hole
+ (Aether)
Creates a white hole. Continuous volleys of magic shockwaves and blasts are thrown at anyone near it. It also pushes people away from it
NeGatiVe-PoSitiVe
(
/ Darkness) + (
/ Aether)
Shoots a slow blast. Anything that touches this blast has an inner conflict created inside of them so strong, that they get shredded from the inside out, and essentially become a time bomb
Great Storm
(Any Lightning Variant) + Storm (or wind, but becomes much weaker)
A storm is created by the user. Depending on the lightning used, that exact lightning will strike down.
Grand Glacier
+
+ 
Creates a massive glacier that greatly decreases the temperature of anyone nearby, gives various buffs the the user, and makes synergies MUCH more powerful. People touching or too close to this also take damage
Endless Nebula
+ (Solar/ Flare)
Works similarly too bubble link, creates “Novas” that explode on contact in an area around the user, however unlike the bubbles, when they disappear they still explode
Wings of (Fire name)
(Any fire type) + (Pheonix)
Gives the users wings of whatever magic they combine phoenix with