Riku, Walker in Darkness

Seek the Light — Whenever Riku deals combat damage to a player, look at the top three cards of your library. Put one into your hand, one on top of your library, and one on the bottom of your library. Then, if you have seven or more cards in your hand, Riku becomes a Human Keyblade Wielder.

Corridor of Darkness — {u/b}: Riku phases out. Activate this ability only if Riku is a Keyblade Wielder.