It is by rule a yellow card. Once you determine he took a dive there the ref literally cannot do anything except give him a yellow card. That's the rule.
Simulationnull
www.footballrules.com
Just can't disagree more. If it's a yellow card it's a yellow card and it doesn't matter when in the game it happens, what the score is, or if the guy already has a yellow. Drives me crazy when a player already on a yellow gets special treatment because the ref is too scared to send someone off. It's Embolo's job to remember he already has a card and keep himself from getting another, not the ref's.