Thanks! It was mostly a numbers game but this is the first time I actually seriously tried to grind it out. Normally I just get to a few ranks for the card back and dust rewards. Of course I had to pick the shortest months to try it in...
The razorgore is ridiculous if it gets going. I also think it's weird that dragon growth minion (+2/2 when friendly dragons kill something) is rank 2 while beast and mech are either tiers higher or grow slower.
Drakonid enforcer will survive even if it goes negative I had one go from -1 after being hit to +1 as the other minion lost its shield. Small indie game company after all.