Svidaniya, Mana Addict

{3}: Deal damage to target creature or player equal to the number infusion counters on Svidaniya, Mana Addict then put an infusion counter on Svidaniya, Mana Addict.
At the beginning of your end step, if you didn't spend mana on spells or abilities this turn, sacrifice Svidaniya, Mana Addict. If there are three or more infusion counters on Svidaniya, Mana Addict, transform it.