I think it was because of the new rulesets and I tried this in the article as well. I was not sure that Equal Opportunity would come into affect as there was also the Back To Basics ruleset, and when I looked at the abilities of my creatures, then Back To Basics was displayed (normal abilities where grayed out, but Opportunity was not shown on those cards. ;)
Coral Wrath is a beast, too! I lost a lot of games because the enemy had that card!