Matterbending Mage
The bounce-on-entry Wizard is old furniture: a 2/2 that tempo-taxes an opponent's board while it lands. What repositions this one is the second line, which pays off a mechanic most tempo creatures never touch. Spells with in their cost are usually the payoff, not the trigger: you untap into a big Blue Sun's Zenith or a fat firebreathing X-drop and swing wide. Here the X-spell is the enabler, and casting one turns the Wizard into an unblockable threat for the turn. That reorients how you build around it. A deck that would otherwise treat variable-cost spells as its win condition can now run this as a body that closes the gap, converting the natural late-game overflow of mana into two evasive points that keep coming. The evasion is conditional on doing something you were already inclined to do, so it costs nothing in tempo when it fires and simply doesn't fire when you have nothing to spend on. The bounce and the unblockable clause point the same direction: clear the blocker on the way in, then walk past the rebuilt board once you have mana to burn. It is a small creature asking you to play a specific kind of curve, and rewarding the mana-sink shell with a finisher that most X-spell decks were missing.
