Tumble Magnet enters the battlefield with three charge counters on it.
{T}, Remove a charge counter from Tumble Magnet: Tap target artifact or creature...
When Treasure Mage enters the battlefield, you may search your library for an artifact card with converted mana cost 6 or greater, reveal it, put it into your hand, then shuffle your library...
When Treasure Keeper dies, reveal cards from the top of your library until you reveal a nonland card with converted mana cost 3 or less. You may cast that card without paying its mana cost. Put all revealed cards not cast this way on the bottom of your library in a random order...
{T}, Sacrifice an artifact: Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)..
When Thraben Inspector enters the battlefield, investigate. (Create a colorless Clue artifact token with "{2}, Sacrifice this artifact: Draw a card.")..