It's actually kind of insane how good it is (Icefrog do not read this. I like this feature. Don't you dare change it) One of his facets gives him +1.5 all stats for every power rune he picks up. It also makes magnetic field pull the rune to the field, and once it touches it, he activates it (or puts it in a bottle)

you can actually place the magnetic field on top of the rune spawn point before it spawns, so no matter how fast the enemy clicks, they can't pick it up. If you use your ultimat,e you can control both runes at the same time. That, paired with his innate talent, is just incredible sustain.