Sure, the cards ceiling involves throwing a chunk of damage at everybody by sacrificing cards like Disciple of Bolas, but trading away a Faerie Rogue for two cards is still perfectly reasonable
Weve already seen players fretting about how Magics five-color system will handle Avatars four elements, for instance
Every Wilds of Eldraine Set Booster contains at least 1 Borderless card
The copied artifact stays in play, even if the original goes to the graveyard, which means a player can use it to get some pretty powerful artifacts on their side and gain the upper hand against more seasoned players with stronger decks
The Aether Heart is a one-shot effect, but that effect is what might be the 7 most powerful worlds in Magic, Take an extra turn after this one. And just like the Marvel, it can sit around on the board for a while while generating energy, making using that effect far easier