In fact, Thragtusk was a solid $4-$6 the entire time it was Standard-legal, and only started dropping with reprints
Still, that's not to say that Magic lacks specific payoffs for cards that say draw in case you're curious, we have a dedicated article about the best card draw payoffs in MTG
There are various ways to use this effect, such as buffing a wide board of Snakes once each before crashing in, or buffing a single Snake, ideally your commander, up multiple times and attacking for lethal thanks to commander damage
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But in general, you often want to have a small number of one drops, plenty of two and three drops, and then a gradually decreasing number of four, five, and six drops
Red doesn't tend to use it too much, but it is a tool in red's arsenal