Player A keeps his hand while Player B decides to take a mulligan, after this decides to keep.

Player A starts playing land and Inquisition of Kozilek targeting B and when B reveals his hand face up on the table counts 7 cards in his own hand.

So revealing the hand is considered taking a game action, so we are in a case of DEC or it's just an ID@SotG?

I'm in the train of DEC, but when I talked with some other judges there's room for other interpretation too.


Luca

Agree on DEC:

http://wiki.magicjudges.org/en/w/Annotated_IPG/Improper_Drawing_at_Start_of_Game

"What’s a little less obvious, though, is that the term “another action in the game” does cover things like a player revealing his or her hand to an opponent’s Duress, or resolving the trigger from an opponent’s first-turn attacking Goblin Guide. Those actions are visible and active. Passive actions are not considered “another game action”, such as allowing a spell to resolve, or passing priority."

Edited Francesco Scialpi (Jan. 11, 2016 05:00:41 AM)

Annotated IPG may not be current. Here is the current text.

A player draws too many cards while drawing his or her opening hand, takes a mulligan after they are permitted to, or the starting player does not skip the first draw step. If this error is discovered after the player committing it has taken another action in the game, the infraction is Drawing Extra Cards.