If you are lucky enough to open a textured foil, you just pulled one of the most valuable cards, and even the base version has a decent price if you don't get the fancy art treatment in your pack
Its quite possible to play Magic without owning a large collection
Typically, double strike is best when it allows your creatures to hit first, hit twice as hard, and survive combat while making sure your opponent and their creatures dont
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It is what it is, make the deck around it if you want