Then you can spend six mana ad nauseum to make a 1/1 Soldier creature copy of any artifact you control, like the aforementioned Spine of Ish Sah or Mycosynth Wellspring or even just a Sol Ring or Gilded Lotus
That is some expensive cardboard
Its not always obvious what cards are going to rise to the top of the economy, and some of the Pokemon cards that end up being most valuable can be surprising
Any cost imposed by a card with a silver border, primarily Un- cards and holiday cards
The conjure mechanic also gives us access to a lot of cards that would otherwise never be put into Arena
To explain just why Neheb was impacted so badly by these changes, some of red manas most potent cards allow players to have multiple combat steps within the same turn, with Murders at Karlov Manors Anzrag, the Quake-Mole being a recent example