Overall though, I feel your ways of generating tokens is very on theme, but not very sustainable
Activated abilities of creatures that include a tap symbol in its cost require continuous control over the creature since the beginning of the players most recent turn: 602.5a
So with some discernment, I picked the best of the best in terms of power, playability and fun and had the makings of a pretty potent and evil deck befitting the Multiverses Big Bad
Massacre Girl gives all your creatures wither, a keyword not seen on a new card since Eventide on a new card
They may never come in untapped, but that downside often isnt actually a hurdle if you carefully time when you play a mana ramp spell or fetchland
For each of them, create a token that's a copy of it