Rob, Rule Lawyer

When this card is in play if an opponent skips a
step or incorrectly uses a spell or ability, point
out the mistake, that player loses the game
If you skip a step or incorrectly use a spell or
ability, a player (whether still in the game or not)
can point out the mistake, you lose the game
"bUt tHaT Is aGAiNsT tHE RulEs!!!"