You want to be able to cast a spell or two every turn, and having too many expensive cards will stop you doing that
The four oldest sets: The First Chapter, Rise of the Floodborn, Into the Inklands, and Ursula's Return, are rotating out, but over half of the Fabled set consists of reprinted cards from those first four sets
All Spongebob Secret Lair Bonus Cards so Far As of the writing of this article, we know about the following Spongebob Secret Lair cards: Smothering Tithe Collector number 7009 cOuNTeRspELl Collector number 7010 Dismember Collector number 7011 Command Tower Collector number 7012 There could be more that have not been discovered yet, but this is already more bonus cards then there are Secret Lairs
The best you could do was bring out a Serra Angel or Shivan Dragon
What Happens if You Copy a Creature Spell
It can act as removal, a stunning effect, or a way to gain life once all the other effects have been exhausted