The Inkwell represents how much Ink players have each turn to spend on playing cards and activating abilities and effects
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"Heraldic Beast", potent resource engine with incidental Machine/Psychic typing synergies "Raidraptor" and "Phantom Knights", providing more Rank 4 boss monster options, "Shade Brigandine" access, and DARK Attribute synergy "Armored Xyz", accessible via any Rank 4 and allowing "Full-Armored Xyz" to immediately turn "Power Reserve" into a Rank 4 during the opponent's turn
This will trigger many of the decks monsters, which often say whenever the player gains life, making this a surprising activation during the opponents turn
If you're in a multiplayer game, you should try to pit your opponents against each other while you bide your time and gather strength