Opposition Agent prevents opponents from tutoring, making it so that every time they would search their library, you search it for them instead
It can save a utility creature from basically all removal (even board wipes), and also enables two-card combos with targets like Devoted Druid
When people say, pokemon cards, they are typically referring to the tcg
In other formats, most players are loath to pay this much for an effect they cant fully control or even guarantee will have targets
You have so many different creatures at your disposal, and most will come with some sort of mechanics attached, such as Reach, Vigilance, Deathtouch, Menace, or Trample, while others are token generators