I love the idea, but
I think you should lower the cost, 7 is high for a simple spell.
&
I think you should drop the part about the next card being chained, perhaps make this a permanent that applies chained for a cost?
My worry here is that, depending on the deck, this could allow a person to play a ludicrous amount of cards in one turn.
On a second note, perhaps if this could also be used on your opponent?
(I've been thinking of making some time series cards specificaaly aimed at decking out the other player...)