While this is a serious restriction on the mechanic (itd be much more powerful if you got a benefit every time you played a spell), this restriction allows cards to be more aggressively costed
While not ideal as the first choice for your purchase, it wouldn't hurt if this was the first product you bought
Grafdigger's Cage relies on the opposing strategy focusing on creatures, but thats the case often enough to run this
And if you're running a token-heavy strategy Saprolings, Soldiers, Treasures the table experience falls apart fast
Of course, the cards flexibility is legendarily good
Clone spells are something we've gotten more and more of recently, and Ember Island ProductionEmber Island Production gives a whole new take on that effect