Chaotic

From BoardGameGeek:

Chaotic is a collectible trading card game in the similar vein as the popular game Yu-Gi-Oh. The game allows 2 players to use fantastic creatures to battle each other across a triangular playing surface. Upon winning a battle, the winning creature can advance deeper into the ranks of the defending player's legion to strike at a new level of creatures. One main feature of the game is that Chaotic cards all come with a unique code that the owner can use on a special website (www.chaoticgame.com) [closed as of 2018] to unlock a virtual version of that card. In this way, the player is provided with a virtual copy of their entire card collection. The other unique aspect is that the stats on each creature are random, so you may have multiple of the same card but unlikely that all stats are the same allowing for strategic advantages.