Hey there! You have a couple options depending on where you live. Every big poker site (poker stars, ggpoker, America’s card room) all take bitcoin but you are playing with USD. So you’re essentially buying and selling with your deposits and withdrawals, which has its pros and cons. We are gradually getting more bitcoin poker sites. The oldest and highest traffic (still very little) site for playing with bitcoin is SwCpoker.club. here the games are denominated in sats. You can play as small as 1 sat 2 sat or all the way up to 5k/10k and anywhere in between. Sadly there’s no lightning capability here but I imagine it’s going to happen one day.