They can be a bit contentious, as not everybody loves losing access to their cards, but it generally leads to interesting gameplay with intriguing options that only come about because you're playing with four different decks at once
They are, however, leagues ahead of MTG Arenas Commander-esque offering of Historic Brawl
Unlike MTG Commanders increasing cost to resummon defeated characters, though, they can only be deployed once per game - making the timing of when to unleash them an even more crux decision
Secret Lair x Street Fighter is a fun detour and a nostalgic tie-in for gamers of all ages
Numerically, these are higher than the value cards, but in some games, the Ace may hold a higher value than any other card in the pack, even though it represents the number 1