One card in hand is not "free"
QFT, but you normally have more than one use for these bad boys in a deck. In an Immolation deck, they serve as both Immo fodder and cheap finisher damage. In an Immobow, you can usually buff them so that they stay alive indefinitely, getting a very cheap, powerful creature (besides obviously being Immo targets). Finally, paired with Fractal and Sky Dive they make for a very good One Hit Kill deck, which is both fun and effective.