Silenia, the Battle Mermaid

When Silenia, the Battle Mermaid Queen enters the battlefield, create a 2/2 blue Merfolk Warrior creature token with hexproof.

Whenever Silenia, the Battle Mermaid Queen attacks, you may tap any number of other untapped Merfolk you control. For each Merfolk tapped this way, Silenia, the Battle Mermaid Queen deals 1 damage to any target and you gain 1 life.