Mainly because some are valuable enough that you should declare them on your insurance
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SR Super Rare Diabolica the Draconique General X DARK Level 8 [ FiendEffect ] ATK 2300 DEF 0 If a Fiend monster(s), except "Diabolica the Draconique General", is sent to your GY by card effect (except during the Damage Step): You can Special Summon this card from your GY (if it was there when the monster was sent) or hand (even if not), but banish it when it leaves the field
Broadly speaking, though, you can group a lot of these decks into some broad categories that help to define the format
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Ephemerate One of whites biggest strengths is to blink creatures with good enters-the-battlefield abilities, and Ephemerate is a two-in-one blink effect thanks to the rebound ability