Magic: The Gathering Arena has an economy that is, frankly, not very kind to the player
Now, if you're talking about a subset and it's clear which ones you mean ("The DFCs in Zendikar Rising "), you can shortcut to just saying DFCs
The deck features 32 different legendary creatures and 8 legendary planeswalkers that can generate tons of value through powerful effects including generating creature tokens (Faldorn, Garth, Jenson, Minsc, General Ferrous Rokiric, Kari Zev, etc), casting free spells (Etali), generating creatures abilities or buffs including +1/+1 counters, first strike, flying, deathtouch, double strike, haste, hexproof, cascade, indestructible, lifelink, menace, reach, trample, vigilance (Halana and Alena, Odric, Surrak, Marchesa, Garna, Imoti, Raff), tutor abilities/card draw (Sisay, Kolvori, Niambi, Vega), Buffing your army (Jodah, Rienne, Arvad), and many more
Since the Lorcana community already knew how ridiculously expensive these D23 promos have been in the past, many were prepared to get their hands on the 2024 exclusives