Oculus Rift + Duel Disk + Unity3D + RFID/NFC Arduino Reader
So we have a plastic toy Duel Disk and some NFC chips on the backs of playing cards.
We have an NFC reader sending input to Unity3D where we've put 3D models of the monsters on the playing cards.
And we've integrated the Unity game with the Oculus Rift so you can see your monsters come to life in VR.
Here's a video of a duel disk: https://youtu.be/SR-F99N10Pc
Childhood dreams accomplished.