Rigger, the Boarding Party

Set Sail {2}{u}{r}{w} (You may cast this card coverted
for its Set Sail cost.)
At the beginning of each end step, bolster 1.
(Choose a creature with the least toughness
among creatures you control and put a +1/+1 counter
on it.)
When Rigger dies, return it to the battlefield converted under its owner's control.