Having a huge supply of ink at your disposal is already a massive advantage to have against your opponents, and Gramma Tala, Spirit of the Ocean turns that functionality into a game winning strategy
It's so popular because it only costs 3 ink to play, and its two abilities allow you to both gain lore and draw cards, two things that help you win the game
By forcing them to stay exerted, you also keep them vulnerable to additional challenges, making it far more risky for your rivals to use their characters with this card in your deck
4 : No folds, chips, scratches, etc., but with a few small white chips
For many, deckbuilding is an enjoyable part of the game, because each player can make a deck completely their own