Its Fighting Claws attack does 60 base damage, plus 70 damage if the opponent's Active Pokemon is an ex (which Darkrai is), plus 20 damage for hitting Darkrai ex's weakness
This Pokmon deals 100 damage or 330 if its a Tera Pokmon
Glimmer itself was eminently playable and you can split this card's cost up over multiple turns
I mean, theyre circus animals with an insane range of different strategies and abilities
So any megas that either hits crazy out of the gate as a stage 1/basic can be a huge demerit if you don't stop your opponent, or you have two meat shields that will get you to the last guy that will win you the whole game
If I look at the top card and its a Plains, I have gained more information about the deck- I now know that the chance of the top card being a Plains is 100%, and the chance of the next card down being a Plains is just 29 out of 59