I own more than half of whats on the market atm and i own more 0xps the the market too try looking for anyone else with this many
Say I own 5 Lyse Teria Cr (I don't, this is just a example). It is now ok sell them for 10M each?
Lots can increase the price slightly (5-10k in your case).
^Actually, if someone owns the majority of a card (or all copies of a card in extreme cases), that person can effectively set the price at whatever he/she wants (particularly if the supply of the card is limited, as is in the case of crs). It's called monopolization.
However, I highly doubt OP has enough copies to affect the price at all. There are probably tons of people who stocked up and will stock up on Flora hoping its price will go up once it goes out of New Blood.