The additional text here is that it costs one mana less to cast for each creature card in your graveyard, and it can be as cheap as one Black mana
It will also add more cards to the game, including Amonkhet and Hour of Devsatation
At the beginning of your end step, put a +1/+1 counter on each modified creature you control
Although these cards originate from legitimate stock, they are deceptive because they are intended to pass as something else, such as a rare promo or a high-value version
Because the last ability of each Opposition Agent is trying to exile the card and give permission to play it, the owner of the exiled card chooses which effect wins
Red, white, and black have all had varying degrees of artifact support over the years, but this legendary creature really ties together the reanimation, Trash for Treasure effects, and death trigger possibilities by providing a sacrifice outlet that also gradually increases your Treasures and creature tokens