Enigma Sphinx
Cascade was always a self-cannibalizing mechanic: cast a spell, and it digs through your library to throw a cheaper spell onto the stack for free. Most cascade cards burn that single free hit and move on. The graveyard clause here builds the engine that the rest of the cascade roster only gestures at. When this dies, it goes third from the top of your library rather than to the bin, which means the next thing you draw past two cards is a seven-mana cascade trigger waiting to fire again. Reanimation-proof in a way that frustrates graveyard hate, but more to the point, it converts a dead creature back into a deferred spell, and a spell with cascade is a spell that pays for the next one down the chain. The Esper color identity is doing real work too: a flying 5/4 body that recurs is a clock and an air defense at once, but the recursion is what asks you to lean into it. Build a curve that wants a guaranteed six-mana-or-less cascade hit every time the Sphinx returns and you have a loop that refills the board on its own schedule. The body is almost incidental. What this card actually rewards is treating death as a tutor and cascade as the payment for resurrection.
