Each token must attack the opponent it's associated with if able
If we can keep Teferi off the board, Didn't Say Please and Thought Collapse allow us to play a weird control-mill game, where we try to stick a copy or two of Drowned Secrets, always leave up a counterspell for whatever threat our opponent might have (while hopefully using the rest of our mana to cast cheap mill cards during our turn), and slowly mill away our opponent's library as we counter their threats
This series of small sets was released via mini-packs, which only included two random cards per pack, with no guarantees of receiving a holo
Thats the main reason why cards like Doubling Season are so powerful
To be viable in Modern, a card typically needs to be cheap and efficient or offer unique utility, since the format is fast-paced and highly competitive
Phyrexian Dreadnought ($278) Phyrexian Dreadnought has a very real drawback, so it's not something to just jam in a deck because any deck can cast it