At one of the latter stages of casting spells a player defines its total cost: Total cost is a spells mana cost or alternative cost, plus all additional costs, plus all effects that increase mana cost, minus all effects that decrease mana cost
But it also has some of the most powerful words in the game in its text box, untap all lands you control. They did make sure to balance this so it isnt completely busted
It turns non-creature artifacts into creature artifacts, and vice versa
Still though, a sealed booster box of this set will set you back a cool $3,000 and with good reason thanks to notable chase cards such as the eminently powerful ramping tool Grim Monolith, the Squirrel kindred powerhouse Deranged Hermit and artifact recursion machine Goblin Welder
Great Yawgmoth, Father of Machines, saw its perfection
Pulling teeth, the card, excels because even though we think were looking at an image conceived just to make us feel sick, we may very well just be looking at a correct depiction of the point of view of a dentist from medieval times
