Polly, Captain's Companion

Companion—Each creature card in your starting
deck is a Pirate, Bird, Kraken, Leviathan,
Octopus, or a Serpent.
Flying
At the beginning of combat on your turn if you control three or more other Pirates, put a +1/+1 counter on each Pirate you control for each
Treasure you control.
"Polly is master's favorite."