If its a permanent card, they put it onto the battlefield. Sure, its a little hard to predict, but that also makes for better Commander games, in our opinion
Colin Bakers Sixth Doctor card contains the ability Time Lords Prerogative, which allows players to copy any historic spells they cast once per turn, with the copy not being classed as legendary
Due to their multiplicity, most creature tokens are individually weaker, and even the strong ones tend to be fairly vanilla
Of course, it's less impactful for a mechanic to be dubbed 'Commander Evergreen' than regular Evergreen, since Commander games have smaller sets, and more mechanical complexity in the first place
These cards allow players to invest mana to reach new "levels" of enchantment power, albeit using a cleaner, Saga-style frame and starting at level 1 instead of 0