These Slivers offer quite a range of abilities
Ill try to be succint: Spike being a woman is the only way you could have a woman in the cycle without a name change, Johnny/Jenny and Timmy/Tammy have name changes but Spike is gender neutral
This was a major innovation with some flawed executionMagic cards have to rotate by the games rules on tapping, so making cards that are confusing to rotate is a big problemthat would lay the stage for perhaps Magics most significant innovation in transformation years later, the Transform mechanic
I just think Rydia's Return is overcosted and not good enough, though it does seem good out of the sideboard for slower matchups
So, a 3 rating across the board, right down the middle
Draft Boosters are great for Limited playif your players are seeking a little more spice, you may guide them to Set Boosters