Runningwind, Outlander

Flash.
When Runningwind, Outlander enters the battlefield, all creatures you control get double strike until the end of
your turn.
If you own a card named "What Remains" in your
library, your hand, or your graveyard, when you attack
with Runningwind, Outlander, you may search your
library for a creature card with power 3 or less and put
that card onto the battlefield under your control.