Craig, Undercity Sleuth

When Craig, Undercity Sleuth enters the battlefield, you may pay 2 life. If you do, target player reveals their hand. That player keeps their hand revealed until your next endstep. During each endstep, you may pay
an additional 2 life. If you do, that player continues to keep their hand revealed. If you
do not pay 2 life, that player no longer has to keep their hand revealed.