Theyve all crept up in price (ok, not so much the green one), and generally have evaded reprints to this point
You have a few ways to cast larger artifacts than you normally would when you have Shimmer Myr on the board
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For such a low ink cost, it can cause a real headache very early in the game, and its card-discarding effect can quickly throw a wrench in your opponents plans
Between reprints, Commander sets, Universes Beyond, Secret Lairs, and more, Magics total number of cards has ballooned over the years
This can range from keeping a poor opening hand, not understanding the threat level of yourself or players around you, all the way down to just simply bad sportsmanship