Glitterfang

A creature that rents itself out for exactly one combat. The end-step bounce means this never sticks around to block, never survives a sweeper aimed at the next turn, and never builds a board: it shows up, swings once thanks to haste, and goes home to be cast again. That return-to-hand clause is doing two jobs at once. It caps the card's standalone value to a single point of damage per turn, but it also turns the Spirit into a repeatable trigger you can replay every turn for one red mana. Anything that cares about creatures entering or spirits arriving gets a renewable resource that never gets stranded on the battlefield. The design tension is between the haste (which says "attack now") and the bounce (which says "you own nothing"), and the resolution is that the card was never built to be a threat. It was built to be an event that happens over and over, the closest a one-drop comes to being a cantrip you cast off the top of your hand each turn. Most spirits of this era leaned on their bodies; this one leans entirely on the verb of entering and leaving, which is a far stranger thing to ask a creature card to be.