The source code is available here
However, getting multiple cards back in the deck in a way that makes them easy to find can be difficult, but one card circumvents this
Throne of Geth Id say Throne of Geth is a proliferate effect specifically for artifact decks, but even decks without a central artifact focus can still generate Treasure, Food, and other trinkets to feed it
Unlike Double Spell, there is no hand cost A card that takes damage if you use his spell that you added
Ok Switch #91 (Pokemon Roaring Skies) Details All prices are the current market price
Almost every card has some kind of ability that can range from a small boost to a potential game-ender, but the problem for new players lies in when they actually happen