Using a Smoothing Mechanic

Am the obscure s all but information. A mechanic called exploit, where was exploit? Exploit was om, the blue black mechanic. And i think dragons of tarker and originally was in am n o tarker am. The idea is that when this creature enters the battle battlefield, you can seck a creature if it generates an effect. So we made a concentrated version of the fact which says, when they play a spell, so they sacrifice a creature, you get a copy of the spell. But what they found in am  was just let them sacrificed any creature to gain extra cards. They put a little too much playing tokens on it, so they put a number