(In short, does my next official game against my opponent in the same tournament count?) No, unless the tournament organizer says otherwise at the beginning of the tournament
TCGPlayer.com is the largest collectible card marketplace on the web, with hundreds of brick and mortar sellers listed
Overall, this Secret Lair has pretty darn good value for money
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For red, you can possibly rely on redirect spells, as mentioned in the Knowing How to Build a Commander Deck Will Require All Kinds of Removal section
This isnt hard in Grixis, of course, but it is different than Vampires usually play