If you find its mana cost a bit too much, then opt for the Plot mechanic, which does delay the casting but also reduces the cost by a single green mana
Because of the different box variants its hard to provide specifics, but here are my general rules for spotting fake Pokemon booster boxes: Colours that look off too pale, too dark etc
You received one random card when you purchased booster packs of cards for a very limited time
These are mechanically unique cards that will be legal in Eternal formats
The top/expensive end of Modern Horizons 3 cards are absurdly strong eldrazi, followed by transforming planeswalkers, and one of the true treasures of the set, fetch lands
I think is worth mentioning: The success of this bottom-up approach stands in stark contrast to top-down systems like those from Wizards