In short, it is not simply that unique 4-card caps did not exist, but if they had existed at the time Limited Edition was released, they would have rendered large swaths of the set unplayable in 1993
Ajani, Outland Chaperone does less buffing, but generates lots of little creatures and has some of white's conditional removal
Rootha, Mastering the Moment Rootha, Mastering the Moment is an easy one to get behind because hasty evasive tokens can be a win condition on their own
However, the counter-target spell card was experiencing problems with Cascade and drastically decreasing the fun of metagames
Suddenly, each 1/1 deathtouch for 1 mana becomes a threat, effectively having toxic 2, so to speak