At the current moment, thanks to the Pokemon craze going on, Pokemon takes top billing over Yu-Gi-Oh, even beating out Magic: the Gathering as the best selling TCG overall
Proper nouns and legendary cards from Magic 's Multiverse don't exist in these partners' worlds, so without giving them different names, certain Commander staples aren't usable in preconstructed Commander decks
We knew what cards were good, because we had played similar formats before
This is a self-enabling engine that your opponents will struggle to remove
So, without further changes, I don't think Kaervek the Merciless is worth it
Despite confusing colloquialisms like spells matter, spellslinger deck and so on, cards are spells on the stack, permanents while in play, and just cards everywhere else