Gambling

Roll X amount of 20 sided dice.
(if you roll one dice ,it has to be six sided, and
it deals damage based on the roll to target
creature or player)(if you roll more than
one and the combining result is an odd
number, you take half of that amount of
damage rounded up.)(if you roll more than
one dice and the combined result is an even
number do that amount of damage to target
creature or player)