Genichiro, The Last Ashina

Genichiro, The Last Ashina gets a +1/+1 counter for each modified creature you control. Whenever Genichiro, The Last Ashina attacks, put a +1/+1 counter on
target creature.Then Genichiro, The Last Ashina deals X damage to any target,
where X is the number of +1/+1
counters on it.