Whats more, theyre generally tight on mana unless they get luck and/or draw Sword of Feast and Famine, so theres a very real chance they wont be able to cast the cards that are put into exile
Because the creature is already in the graveyard when the enters-the-battlefield ability resolves, you can name Elemental, return the Grave Sifter to your hand, and bring back every other Elemental alongside it
Harsh Scrutiny is a fine answer to Whirler Virtuoso, which is the only other card a low to the ground deck like that is super afraid of
Fact or Fiction is another card to have fallen far from grace
While there are ways around having to pay the full cost, it would be much easier to lower the cost overall
With so much information constantly being released, its not uncommon for a few details to slip through the cracks