Captain's Sidekick

Vigilance, Double Strike
When Captain's Sidekick enters the battlefield
under your control, all Merfolk, Humans, and
Pirates you control get +3/+3 and Double Strike
for the rest of the game.
{3}{u/b}, Sacrifice Captain's Sidekick: Create two
clones of any creature on the battlefield and
permanently tap a target opponent's non-land
card. "She's quite tricky. At one moment, she
would look like an angel, at the next, a titan of the
seas!"—The Captain