It is cheap, broad, fairly reliable and fairly effective
Its hard to imagine a dedicated Dragon deck not running at least a couple of copies of this card, so getting in now while its just $1.50 seems like a smart move
The reason I have Serum Visions ever so slightly higher is that it is still very very close to Preordain in general all round power, it typically gives more overall information as well (if you keep at least one card from a Preordain scry you see one less card overall than you do with Serum Visions or Ponder), but most of all it is becuase Serum Visions affords you the best synergy with top of library effects
Still, Basic Energy has some truly beautiful designs , especially in modern Pokmon sets with dynamic foil patterns
Karvanista, Loyal Lupari Here's another dog that pumps humans, though the impact of Karvanista, Loyal Lupari is much greater than that of Torgal
The format is also pretty hostile to artifacts because of Kolaghan's Command, and weak to enchantments in general, so Leyline currently has a greater chance than normal of sticking around the battlefield