This puts all of the opponents creatures at risk when they block, and he will be forced to block with more creatures than he would normally, so that he has more of a choice when you activate the ability
Depending on what cards they find during draft sessions, a player will likely build a Rakdos deck to be aggro-oriented or sacrifice-oriented, with one effect being dominant and the other being splashed in for flexibility
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But the cherry on top is Dark Magical Circles second effect
Products for Every Fan The set will launch with a full product suite, including Play Boosters for drafting and collecting, and premium Collector Boosters filled with special art treatments
It doesn't copy whether that creature is tapped or untapped, whether it has any counters on it or Auras and/or Equipment attached to it, or any non-copy effects that changed its power, toughness, types, color, and so on