Visually, we can explore contrast between well-rendered figures with graphic, stylistic elements to emphasize this idea of duality
i don't want them all to share the same mechanic as that is just plain boring in my eyes, so i experiment
VSTAR cards play a similar role to older Mega Evolutions and Level X cards, in which they are played on top of your fully evolved Pokemon
Whenever chaos ensues, remove two time counters from each suspended card you own
For example, removal-heavy decks tend to have a headache against decks that don't care too much for the battlefield (like control decks), or decks that are happy to fill their graveyard (like reanimator decks), or decks that can sacrifice creatures when their enemies point removal at them (like aristocrat Commander decks)
The removal in the deck is a bit untraditional, focusing on permanents that can remove problematic permanents rather than instants or sorceries