Karlov is one of the best sacrifice commanders and makes deckbuilding extraordinarily easy in this situation
While, sure, rushing would make battle significantly easier (and get those coveted shiny cards), it ends up cheapening one's own experience with something thats supposed to be fulfilling over time
It could be months or even years before a player finds the Serialized One Ring card, and there's no guarantee whoever finds it will make it public
However, the centerpiece of these decks is always Gardevoir ex, and this will continue to be the case until it leaves the format in 2026
Ill also point out that green legendary matters is something that weve been getting a slow trickle of lately, with Kolvori, God of Kinship on my Cube bucket list, in a similar space with Mox Amber