'Attack with X creatures' and 'Kill X creatures' quests lead to bad and unfun gameplay
The daily quests exist to motivate players to log in everyday and play games. Most quests are open-ended enough that players can play whatever kind of deck they like to finish them, and that's great cause it motivates people to play. The 'attack with X creatures' and 'kill X creatures' quests however don't allow that freedom, they force you to play certain kind of decks, that most people don't like, and force you to play sub-optimally as well. The best way to finish these quests is to stuff a deck full of haste creatures or removal spells, and spam them every game until your hand is empty, concede and move on to the next match, winning no matches along the way. Nobody is having fun this way, and I'm demotivated to play any more games that day because I had such a miserable time. This seems to be the exact opposite of what these quests should achieve, so I don't understand the existence of these two specific ones, they don't engage players to create fun gameplay or spend a lot of time playing, they do the exact opposite. They make both me and my opponent feel bad, decreasing the chance we would play longer or spend more money on the game.
Gameplay would be so much better if people wouldn't be forced to sub-optimally spam haste creatures or removal spells, gameplay should revolve around players playing their decks to the best of their abilities and trying to win. If you care about whether or not your players are having fun and motivated to spend time playing, please remove these two terrible quests.