If adding a single red mana one time for free is too good for Modern, then cards that repeatedly offer free mana (Chrome Mox, Eye of Ugin, and Mox Opal) or offer a one-time burst of more than one mana (Seething Song and Summer Bloom, which was primarily used as a ritual with bounce lands in Amulet of Vigor decks) are too good as well
if youre of a certain age, you remember the reign of the Beanie Babies, or the vintage comic books, or hell, the baseball card surge in the 80s and 90s
The best approach is treating cards as a small percentage of a broader financial plan, not the plan itself
The cards found in the search will be exiled rather than be put wherever the spell or ability tells the opponent to put them after finding them
With all that being said, the top chase card from the set is mightily impressive
However, you won't even be casting it unless you hit its threshold cost (seven or more cards in the graveyard)