Undyne, the Undying

Persist
When Undyne, the Undying enters the battlefield, tap any number of untapped merfolks and/or soldiers you control. Put that many spear counters on her.
{t}, remove a spear counter from Undyne, the Undying: Undyne, the Undying deals X damage to target creature or player where X is the number of spear counters on her.
{t}: Put a spear counter on Undyne, the Undying