one piece flanked by legends booster box OP-06 English blue Marco One Piece Flanked by Legends

As far as dealing with things you care about, it is not too far off a Counterspell on wings

Its a bit unique how it works since it activates from the graveyard, but that makes it a very difficult sac outlet to interact with

Chose and chosen are important for card games in general as this type of interaction-dodging is common

Individually these effects are marginal: but combined they form a card that was so good, many non-red blue base decks started playing red just to get it (plus Flametongue Kavu, to be perfectly fair)

In Commander, its very much possible to stack up multiple emblems by replaying Sephiroth from the command zone, and once youre at that point, the games probably over