Tarfire

Take a Shock and staple a creature type onto it. That single edit is the whole point: a one-mana, two-damage burn spell that also reads as a Goblin for every effect that cares about the word. The downside is plain enough, a damage short of the three-damage standard Lightning Bolt sets for cheap red removal, but the type line buys the gap back in any deck wired to exploit creature types on noncreature cards. This was a hallmark of the era that introduced kindred instants and sorceries: removal that carries a lineage's tag purely for synergy, and Tarfire pares the idea down to nothing exotic on the stack, just two damage to any target at instant speed with the type line doing the work the spell itself does not. The leverage is narrower than it first sounds, because an instant never enters the battlefield and never sits among your permanents; it will not feed counts of Goblins in play or fire enters-the-battlefield triggers. What it does feed is anything that cares about a Goblin in hand, in the graveyard, or on the stack: tutors that fetch a Goblin card, recursion that returns one, payoffs that reward casting one. That is the precise seam this design lives in, and the only reason a deck reaches for Shock-with-a-tribe on purpose.