I actually made a T50 grinding deck in trainer:
x6 Siphon Life, Fire Lance, Ice Lance, Fahrenheit, and Animate Weapon. (I know, you only need 5, but meh)
Moar Quanta, and BAM! you can clear a T50's health with just your starting hand. (FG needs you to draw again to finish 200 hp off)
I actually started grinding, getting a few hundred per win off T50. But then I feared getting banned, and I felt lazy, so I stopped.