[@KatherinWinter]
well depends what he is summoning. The entire key system is specifically about celestial realm, and pretty much anything besides the zodiac and the king is pointless which is what I hate about it, granted I'm only person playing as a summoner currently so eventually I could gather them but 12 good, + an amazing summon by sacrificing one. along with pretty much unknown amount of pointless useless ones.

If it's a simple summon like summoning two hound like creatures, a simple few moments incantation which he needs to concentrate on. If it's like a demon he has to sacrifice blood, along with an incantation and give something up to use a catalyst, then there are ones like shikigami which use paper cut into the shape of a human with an incantation written on it which he just has to give the chant and throw it to make those work.

I'm basically just combining the different forms of summoning. yet again in the end it's up to you if it's alright, if not then I will use the keys but I would request the keys be slightly changed so it isn't like getting the zodiac is the only good thing.