Before that it was in Commander 2014
Once its out, you get constant knowledge of your top card and the green light to cast creatures from there
If Im not playing a bunch of cloak, morph, or megamorph creatures, Id want enough creatures in my deck so that the odds are pretty good that the other two cloaked cards would include another creature I could flip up
The list was for cards that didn't yet exist but that the team wanted to see get designed
If your Ratcatcher does not survive the turn cycle, you essentially spent six mana to get a removal spell out of your opponents hand, putting both players behind of the rest of the table
When combined with auras that give it protection from creatures, it becomes very hard to get rid of