The best two are likely Arc Trail (8) and Lightning Bolt (8.5) for their high efficiency and blowout potential
With other complementary artifact mana sources like Thran Dynamo and Grim Monolith, decks could count on being able to get the kind of mana you'd need to justify packing the cards that would let you use the mana from Metalworker to deliver the knockout blow, and their presence lets you turn that Metalworker mana into permanent giant amounts of mana rather than just a one shot deal
$17.99 Publisher: Ravensburger BEGIN YOUR ADVENTURE: STARTER DECKS
If Polyraptor leaves the battlefield before its triggered ability resolves, most likely because it was dealt lethal damage, the token will still enter the battlefield as a copy of Polyraptor, using Polyraptor's copiable values from when it was last on the battlefield
A box without shrink wrap may be easier to tamper with, despite many booster boxes being constructed to prevent opening and re-closing using an intelligent folding box and a cardboard tear-strip that cannot be replaced
I believe that most Gridfinity bins should work so long as you use a bin corresponding to the correct insert (2x2 for a 2x2), although I have not tested
