At about $0.25, you cant beat such value, so you should add this card to most of your decks that include red
Barret, Avalanche Leader Barret, Avalanche Leader turns a deck full of equipment into a board full of rebels, which then get free Argentum Armors and stuff
And then you can -3 to Murder something so it adds in board control to card flow, and both work quite ably here
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Together, they've been able to make up for each other's weaknesses
Likewise, MDFCs like Valakut Awakening dont make the cut on this list, as you should be playing MDFCs in all of your decks and they dont tend to encroach on deckbuilding slots like actual spells