SigmasonicX
Member
Yeah and a 2/2 is 3 mana, and add three to your mana pool cost 0. Coercive Portal and bottled cloister exist.
Coercive Portal is not in Modern and has never been in Standard.
Bottled Cloister's exiling can be considered an upside in some cases, but much of the time, it's a drawback that prevents you from casting spells during your opponent's turn.
The fact is that Jayemdae Tome is what's considered to be the appropriate cost for a 4 mana card drawing artifact in Standard. I remember when it was reprinted in M13, one of Wizard's articles mentioned that they were nervous about bringing it back due to it potentially being too powerful in Limited.