My System Has Ultimate Permissions

This is a world where travelers are everywhere, and each traveler carries a system. There are so many systems, so naturally it's not surprising. Therefore, in this world, systems are divided into ABCD, 369 and so on. The higher-level systems have more functions and stronger effects. But after An Liang traveled to this world, his system fell asleep for three years. Three years later, he discovered that his system had the strongest ability - to capture other systems. From then on, as long as other people's systems have functions, he can also have them. [System Control Card]: Borrow your system to visit the mall~ [Point Stealing Card]: Use your points to buy things~ [Low-level Deprivation Card]: Your system is my system! And as your own system upgrades, more types of cards can be used: [System Control Card], [System Transformation Card], [System Upgrade Card]...