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It doesn't replace the existing archetypes, but adds a new layer of deck variety: Boros Beatdown can optionally be built as Boros Soldiers, Rakdos Midrange could have a Warrior theme

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With Regenerate, you essentially set up a replacement effect in the form of a "regeneration shield", so to speak, before the Creature would be destroyed, and once that's done, Regenerate replaces the next instance of the destruction of said Creature with: tapping the Creature, removing damage from it, and removing it from combat

Damage from your attack is indicated to the right of the attack name

But of course, theres a way to skip all of this Credit grinding, and its through the Product Code Cards