Adrift in Fog

Whenever a Staker enters the battlefield under
your control, put a chip counter on Adrift in Fog.
{2}{u}{b}, {t}: Remove 4 chip counters from Adrift
in Fog. Choose a card from your library at
random. Put it on the battlefield face down.
It becomes a 2/2 colorless pirate with hexproof.
When Adrift in Fog leaves the battlefield, add all
face down cards searched this way to your hand.