Black Heart

Vigilance
When this card enters the battlefield and during your Upkeep; Place 1 Share Counter for each Lastation card you control. Black Heart gets +1/+1 for each Share Counter on it. During the End Step, Remove all Share Counters from this card (min. 1.) If you cannot, Transform this card.

Infinite Slash—{1}{b}{b}{t}: Target player takes damage equal to Black Heart's Power. You can remove 3 Share Counters from this card to activate this ability instead of paying the mana cost.