The former lets you punish color-hungry decks like Domain, while the latter is essentially a free board wipe against the likes of Gruul Aggro
If heads, does double the damage if tails, the 3 of the opponents cards are paralyzed no matter what defenses or buffs it may have.can be use at the start of the game no matter what
As a direct point of comparison, this exact Marnie card appears in English's Sword & Shield Base Set, but only commands a fraction of her Japanese value, settling at around $30
From there, you can follow up with a Pippin, Warden of Isengard, and its ability to sacrifice four Food tokens to give all your other creatures +3/+3 and haste to stand up against your foes
Will they continue to dominate the market in 5,10,20 years