Lots of the "a deck can contain any number of" cards cost a decent amount. Most are common, but can fetch high pricess. Look at
Persistent Petitioners. A common from RNA that you would have have a great chance at opening several from a booster box, but buying the 20+ you need for a deck sets you above the budget range.
Shadowborn Apostle functions similarly. Point is, most cards like this form their own archtypes (nobody would call Shadowborn APostles a demon tribal,) but can be fun to play if your budget is high enough to include them.
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