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{1}{B/R}: Switch a Killbot or Mary O'Kill in your hand with one on the battlefield. (If a creature is tapped, the switched creature is tapped. The same is true for untapped, attacking, blocking, enchanted, equipped, and targeted. Any counters on a creature are on the switched creature instead.)
Flying Whenever Do-It-Yourself Seraph attacks, you may search your library for an artifact card, exile it, then shuffle your library. Do-It-Yourself Seraph has the text box of each card exiled with Do-It-Yourself Seraph in addition to its own.
Baron Von Count enters the battlefield with a doom counter on "5." Whenever you cast a spell with the indicated numeral in its mana cost, text box, power, or toughness, move the doom counter one numeral to the left. When the doom counter moves from "1," destroy target player and put that doom counter on "5."
Other Riggers you control get +1/+0 and have haste. If a Rigger you control would assemble a Contraption, it assembles two Contraptions instead.