Summoning entities (created monsters / custom spells)

First of all, I'm not saying it doesn't work all the time. The summoning system do work, but certainly not 100%, especially when it involved custom spells (Wich summon custom monsters or specific monsters) or custom monsters (Wich most of time, with the custom spells that is supposed to summon this custom monster, the system doesn't find it, or the search system is not optimized.)

I already have Mewtwo (the Pokémon, so it's a custom monster and I used a custom spells that is supposed to summon him) in the campaign, so he is implemented already in the world. My custom spell should, in that case, search for Mewtwo in the monsters category and summon it Into the battlefield. Yet, this message appears very, very often. He says “No monster found matching ‘Pokémon’ or ’Psychic beast’ or ‘Psychic Pokémon’ etc. But sometimes, it does work, sometimes. That's the problem, sometimes.

I think it’s the “searching monsters” that is not quite optimized, Mewtwo is existing in the monster category, yet it can't find it so can't summon it. I have to change my spells description, or monster description of Mewtwo to try the system to correctly search for Mewtwo when I ask to be summoned, yet it’s not working 100%.