One of my favorite Game Boy games growing up was, unsurprisingly, the Pokmon Trading Card Game
Like any vintage promo card from the WOTC era, though, they're highly sought after now
It allows you to draw a card the first time you put a +1/+1 counter on it each turn, allowing it to grow and fill your hand at the same time
The originals gave you the option of sacrificing or drawing a card, whereas the second ones gave you an effect and you could pay a little extra to draw a card as well
Perhaps unsurprisingly, the currently available leader cards are also the most important characters of the One Piece world, with passive effects that add a bit of extra flavour to each matchup
This is to improve the gameplay experience