This creature attacks each combat if able.
At the beginning of your upkeep, put a +1/+1 counter on this creature. Then you may pay , where X is the number of +1/+1 counters on it. If you don't, tap this creature and it deals X damage to you.
, where X is the number of +1/+1 counters on it. If you don't, tap this creature and it deals X damage to you.