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The game isn't recognizing the card draw ability. It will automatically pass priority without giving you a chance to cast it. Setting a stop on the opponent's end step is a work around. The counter ability appears to work as intended.

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over 4 years ago - /u/WotC_BenFinkel - Direct link

This is fixed for the next release, hopefully coming this week. In the meantime I recommend manually placing stops when you want to cast it - the game will allow you to do so, it just mistakenly thinks you can't afford it. #wotc_staff