Heart of Kiran

The crew cost is the obvious balancing lever on a two-mana 4/4 flier with vigilance, and most decks paid it the ordinary way, tapping a creature or two before swinging. The second crew clause is what made the card a genuine design statement: you may remove a loyalty counter from a planeswalker instead of tapping creatures. That line stitches two card types together that rarely interact. A planeswalker advances its own plan by ticking up; here, ticking down a single point of loyalty animates a 4/4 evasive body at no tempo cost to your board, no creatures tapped, no exposure. The synergy runs both ways: the Vehicle protects the planeswalker by giving you a blocker that costs nothing to deploy, and the planeswalker funds the Vehicle when you have no creatures to spare. It rewards a build that treats planeswalkers as engines whose loyalty is a fungible resource, not a countdown to an ultimate. That is the unusual axis: most Vehicles want a wide creature base to crew them, while this one is happiest alongside permanents that don't crew anything at all. The flying-and-vigilance package keeps it relevant on both halves of the turn, but the loyalty clause is the part that opened space no Vehicle had touched before, and the part that defined which decks wanted it.