Multicolored The first thing that jumps out is the number of loyalty counters being higher than the converted mana cost
These are the official recommended rules by WotC, but its a casual format, so feel free to experiment with other card counts
Making Inferno Titan and Scourge of Fleets every turn prevents your opponents from maintaining a board and puts a clock on them
Casting Esper Origins for two is pretty inefficient, but milling it and immediately getting to Esper Maduin should feel a lot better
Noble has some mild evasion and he also has a higher chance of winning the game basically by himself than Goblin Guide does
Btw, if you accept suggestions, you should add more game modes (such as Time Trial, Multiple choice, etc) Id be cool if Japanese exclusives are added as well