Between the use of fetch lands, instants and sorceries being cast, and creatures dying, a Tarmogoyf can grow quickly, becoming a noteworthy threat for only two mana
Cards with staining will either by designated "ST" or will have a numerical grade that reflects the minimum staining allowed for the grade
When The Pokmon Company reprints a popular card, it can dilute the exclusivity of the original version, potentially causing its value to drop
The difference in power level between the two is not very much in Modern, as we can also see by looking at our last Top 5 blue cards, which were almost all at three mana or below
Then you can cast it prior if it's an instant, so if someone goes to counter your Commander when you cast it and you have no counters in hand to counter back, you might draw it
Then, there's Panharmonicon , a powerhouse from the Kaladesh block that duplicates ETB triggers for creatures and artifacts alike