Its cheap, scalable, and keeps coming back for more
Often you have one part of the combo and need two more (of the recursion, discard and threat) at which point the tutor that can find multiple things for you is the thing
Meowth [20th Anniversary Stamp] #53 Pokemon Generations Keep track of your collection value over time
On your next turn, after selecting your Pokmon on the bench or the active field, you can use 1 Energy card
In addition to the many ways artifact decks have to cheat their threats into play such as [c]Braids, Conjurer Adept[/c], [c]Sneak Attack[/c], and [c]Kuldotha Forgemaster[/c], there are the fast mana rocks [c]Chrome Mox[/c], [c]Mana Crypt[/c], and [c]Mox Opal[/c] AS WELL AS more traditional Green ramp like [c]Awakening Zone[/c], [c]Mana Reflection[/c], and [c]Veteran Explorer[/c], so expect massive threats to start dropping early and often
Some decks like Temur Rhinos play Force of Negation in the maindeck, but most opt to play it in the Sideboard and bring it in when it shines