Subway Train

Two effects that usually live on separate cards, bolted to one chassis: a basic-land tutor that fills your hand, and a 3/1 body waiting for a crew. The optional is the hinge. The Vehicle enters whether or not you pay, so a deck without green mana still gets a two-drop artifact threat that swings once a creature climbs aboard, while a green deck can pull a basic to hand and fix its next few draws without being locked out when the mana is tight. Note what the card actually does with that basic: it goes to your hand, not the battlefield, so this is fixing and card selection rather than acceleration; you still have to spend the land drop to cash it in. That distinction is the reason to attach the effect to a Vehicle instead of a ramp spell. A ramp spell wants to be cast early and forgotten; this one wants to stick around, smooth your land count on the way in, then start attacking once the board can pay crew 2. The 1 toughness is what keeps the aggressive half honest, since the same body that trades up while blocking also dies to almost anything the moment it animates. Depending on which half the table needs that turn, it is either a threat that happened to fix your hand or a fixer that happens to attack.