The odds should be fair, pardoning the house, ofc. ;)

Only using the block-hash as a randomness-seed doesn't make sense. Everyone would get the same cards.

Making a new hash to use as a seed for the randomness that is individual per user, based on the newest block + userid + long/strong timestamp might make it more enjoyable/personal.

If I try and implement it, I would like to make it verifiable. for users too.
I Need to think about that.
How to give users this ability?
I guess all they would need is the blockhash, their user id, and the timestamp that was used plus the hash that came from it to in turn produce the randomness of the draw.

I don't know how much space it would take in the TG bot's text baloon to add all that.

Perhaps a better plan for the website.. Or maybe add a command..

I need to think about it a bit more.. It should take up minimum space.