TARDIS

A Vehicle that flies, then bends the game around whether you happen to control a Time Lord. The design is doing something quietly unusual: it welds a conditional attack trigger to two payoffs from different corners of the game's vocabulary. Cascade rewards you for building a curve with something worth flipping into, so the card asks a deck to stock nonland spells below its mana value; planeswalk is a Planechase mechanic, dragging the ambient plane-shifting subsystem into a card that otherwise reads like a combat piece. Neither happens unless you clear the Time Lord check, which is the restriction paying for the free cascade: this is a themed engine gated behind a themed board state, not a Vehicle you drop into any shell. The body is honest about its role. A 2/4 flier is a durable evasive threat that survives most of what wants to trade with it, and a crew cost of 2 means a single modest creature turns it on, whether you commit power to the attack or hold it back to block. The interesting tension is sequencing: the cascade rider lands on your next spell after the attack declaration, so the card wants you to hold a spell rather than empty your hand precombat, and the planeswalk option folds a second axis of variance into the same swing. It is a crossover novelty first, but the mechanical stitching (attack trigger to cascade to planeswalk, all conditional) is more deliberate than a memento usually gets.