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
Charizard 25/185 - Vivid Voltage The Pokmon Company Pokmon Stage 2 - Evolves from Charmeleon 170 HP Once during your turn, you may look at the top 3 cards of your deck and put 1 of them into your hand
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
Six mana is a lot to nab a creature that the Crystal has exiled, but there are few times where doing so will be a bad thing
With all that being said, the top chase card from the set is mightily impressive