The cheapest graphics card you can play it on is an NVIDIA GeForce 6100. Mythical system requirements state that you will need at least 2 MB of RAM. An Intel Pentium 4 2.00GHz CPU is required at a minimum to run Mythical. In terms of game file size, you will need at least 100 MB of free disk space available.
Mythical will run on PC system with Any and upwards. Additionally it has a Mac version.