The Eevee theme and high concentration of SIRs drove demand far beyond supply at launch
Like most Pokmon cards, the value of Tauros depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (POP Series 2)
They're one step closer to awakening an ancient god
With that in mind, we pulled the ancient spellslinging sorcerer's trick of "playing every ramp spell we could find", combined with some defensive creatures that will survive our various PyroclasmPyroclasms and ping opponents whenever we do anything
However, we can trace its approximate origins back to this card: To my knowledge, Core Set 2015 's Goblin KaboomistGoblin Kaboomist is the first card to create expendable, noncreature artifact tokens with a minimal effect on the game (this is the part where commenters slay me with an obscure card from Homelands )