Here is another mythic rare with potential and a wall of text. The Simic color pair wants to rely on ramp most of the time, but in this case, it looks like the X could be as low as 4 and still be very powerful.
It's just enough to evade Ritual of Soot while drawing you two cards for some more action. Also, the "when you cast this spell" line guarantees life gain and card draw even if it gets countered, which is a really neat way to evade counterspells.
On the other hand, Hydras as a tribe have never played any significant role in Magic: The Gathering, so it's unclear whether the price will go up or down from this point.