I have that Group Instance- Draw Mastery set for this week and it is 100% MISLEADING.

The skill description leaves out a very important detail that I find quite scandalous.

The truth is it only lets you flip the item cards 2x, not all cards, which makes no sense since most probably imagined this was a counter balance to the lowered chances of actually getting ninja tools in the 5.0 update thanks to moon scrolls spamming the rewards options.