yugioh lion card YU-GI-OH! - Kozmo Scaredy (SHVI-EN082) - Shining Victories - 1st Edition Amazon.com: YU-GI-OH! - Number 54:

It was such a contrast to everything else at the time

In a Pirate shell youre able to attack without fear into large creatures and make blocking very difficult for the opponent, because having a Dire Fleet Poisoner to flash in and allow your Pirate to trade with a Bristling Hydra, for example, is incredibly valuable

Also can help you get over a hump by "saving up" mana, even it's at 2 for 1

The final bit of text on Revel in Riches reads that if you control ten or more Treasures in your upkeep, that you win the game

Cards like Vilis, Broker of Blood and Sheoldred, the Apocalypse create a self-sustaining engine where paying life draws cards, which gains you life, letting you churn through your deck