It's okay this is a judgment free zone
When it enters the battlefield, if the player discards a card with one of many forms of counters on it, including flying, then the Indominous Rex enters with that type of counter on it
Then discard two cards unless you discard an instant or sorcery card or a creature card with flying
Nevertheless, it is one of the most valuable within Trick or Trade as a whole, with TCGPlayer giving a current market price of $0.20 for this Flutter Mane
While tournament play is another issue, for casual Commander play, it is important to remember that Magic is a game and Magic cards are game pieces
Compare that with other collector investment options - is PSA grading worth it for Pokmon offers a different risk/return profile for single-card investing, and how to calculate Pokmon card ROI gives you a framework for modelling either approach