You're better off with the Contagion Engine rather than the Clasp. Both are good, but the Engine is more useful. Student of Warfare is a good choice instead of the caravan escort, since it gets first strike faster even though its max level is 7. Training Grounds is just wasted space if you use your proliferate well.
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Seal of Fire is good because you its a sleeper cheap burn that you can keep around til you need it and get it out of your hand. Fireblast is a good old school burn card, you can sac 2 mountains instead of paying its 6 cost. And hellspark elementals are 2 mana, with a 2 mana Unearth ability. You're probably better off with the Ball Lightning. I know this cuz my brother had a pretty badass burn deck once upon a time.
Needs to be blue black so you can drop in Glimpse the Unthinkable as well. can't beat a 2 drop 10 card mill second turn. My friend does that with his mill deck and it sucks..lol.
Does no one use the Monolith combo with Stroke of Genius anymore? I know its old, but its still good damn it!.
Seal of Fire is a great cheap burn early on. And Breath of Darigaaz is a good global hitter. Any burn deck without Ball Lightning needs it..lol.