You need Arms Dealer, amazing goblin, sacrifice a goblin (pay 2 mana) and deal 4 damage to a creature
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Put Conjurer's Closet in, if you use it along with Act of Treason (and similar cards), you can steal your opponent's creatures permanently, not just the turn, I made a deck revolving around this concept (just the list though)
I'd say remove green, put in Act of Treason and Switcheroo, and change the number of some cards
Act of treason would be a good card to put in here