Puca's Eye

For two mana you get a cantrip that replaces itself and picks up a color, which is enough to earn a slot even in a deck that will never satisfy the second half. That second half is the payoff: a repeatable draw outlet gated behind five colors among your permanents, not five in your identity, not five in hand, but five actually sitting on the battlefield. The enters-the-battlefield color choice is a quiet nudge toward that gate, since the artifact counts toward whatever color you name, so it can be the fifth pip rather than a dead body waiting on the rest. The distinction between spread and splash is where this lives: a WUBRG manabase that casts spells across the wheel does not clear the condition unless those permanents stick around to be counted. Colorless card advantage that scales with a domain-style board state is a narrow lane, and this occupies it cleanly, offering a plain draw when the board is thin and a recurring draw engine the moment the rainbow lands.