mtg card arena Starter Kit (2020 ed) — Twenty Sided Legendary creatures don’t untap during their controllers’ untap steps Stronghold Arena · Dominaria United

To start with, this card is an absurd combination of immediate abilities and stats for 2 mana

A deck that focuses on controlling the board and disrupting opponent's creature strategies, such as red control or burn decks, would benefit from using Aether Flash to limit the effectiveness of creature-based strategies

It doesn't copy whether that token is tapped or untapped, whether it has any counters on it or Auras and Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, or so on

If you're curious how your mechanic measures up against famous mechanics from the past, you can do the same calculations I just laid out