Thoughtcast

The printed cost lies about what this card is. Affinity discounts only the generic portion, so the melts away one artifact at a time while the stays put: floor it out and Thoughtcast is a single blue mana for two cards, the cheapest unconditional draw spell blue gets to play with in any deck dense enough to pay for it. That demonstrates affinity at its barest: no body to deploy, no combat math, just the raw payoff of having flooded the table with cheap permanents. The constraint is what keeps the rate honest. The card is degenerate only inside a shell already committed to artifacts and a dead draw in one that is not. What makes it durable across eras is that it scales with whatever artifact density the available card pool supports rather than with its own printed cost: as the field of cheap artifacts grows, the real floor on Thoughtcast keeps falling toward , while the effect stays fixed at two cards. That is an unusually stable piece of design. The ceiling moves and the payoff does not, and the deckbuilding tax never softens. A blue card-advantage engine that costs whatever you have already spent building your board is a strange thing to find at common, and it has stayed the connective tissue of artifact aggro precisely because it asks for nothing the deck was not already doing.