Board Thread:Questions and Answers/@comment-5767007-20140325061554/@comment-24547588-20140326130615

Kota1908 is Right.

If player A chooses not to activate anything then Player B may play 1 card. If the B does then player A can counter it since Player B started the chain and Player A is responding.

That is the reason Abra Cadabra! Can be used on Green Dragon Shield.

However if Player A plays a card first and then Player B responds to that card by playing a card. Player A cannot play anymore cards till the effect of the first 2 cards resolve.