Ranking in TCG

I don't find it fair to have the "decrease rank" feature in the newly updated rank season playmode.
- The cards we get are purely luck based
- The cards we obtained from opening packs are also luck based
Since this entire game is highly reliant on luck and not so much on strategy (unless both players managed to get all the cards they desired), how is dropping rank feature a suitable thing to be included? I can accept minusing rank points within the rank but dropping the rank from "Great ball" onwards is really unacceptable.
Personal experience: I've lost 8 games in a row making me dropped from Great ball rank 2 to rank 1. During the 9 games, I either only get supports cards or opponents managed to flip 3 to 5 heads with misty and all 8 games, my cards are weak to the opponents' cards (thats +20 damage!). I changed my deck thrice within the 8 games and -> Me: Water Oppoenent: Electric; Me: Dark Opponenet: Plant; Me: Fire: Opponent water
With this situation being blamed on bad strategy? I don't think so? Thus, it makes me tired from this game as a whole and affects the mood when playing this game! Hope this can be removed.