From googling about void magic, apparently it's a thing, I found some stuff.
Void magic is the magic of everything and nothing. It's detached. Then some abilities:
sense the presence creatures (remove invisibility)
casting spells using less mana (Costs increases or decreases)
The power to disenchant an item without ever having to break through it's magical defenses (debuff, even immaterial and invisibile)
permanently alter one's own chakras (Change pillar type or mark)
spells that make the caster imperceptible in every way (invisible)
spells that alter the memories of entire nations of people (creatures attack opponent, opponent "forgets" to draw)
Even mana seems to be a questionable issue in the use of void magic; some void mages don't even seem to need it (void mana concept fits great here).
I remember some stuff on virtual particles that line of thought could spur more card ideas.
