These are effects that pretty much show up in every set in common in a particular color: White White always has some kind of lifegain, enchantment removal, and creature removal (which can include Blue Blue always has a counterspell (often two, one hard, one soft), "bounce" ("return BLAH to its owner's hand"), card drawing, creature-control enchantment (most often locking it down), and sometimes has a card sifting, shrinking ("target creature gets N/-0 until end of turn"), or twiddling ("tap or untap target BLAH")
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There are some appealing cards here for the Toxic Twobert, and Radstorm is, well, rad
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Players cant cast noncreature spells from exile: This is probably the most important, and also most unique, ability on Soulless Jailer