yugioh neos deck Elemental HERO Marine - Yu-Gi-Oh! Card Database Armed Neos – Yu-Gi-Oh! Master

I said it when talking about Queen Marchesa and Jared Carthalion, True Heir: you need to combine monarch with other strategies for it to work at its best

negate the attack, and if you do, inflict damage to your opponent equal to its ATK

The archetype's boss Monster, Baelgrill de Nouvelles, negates the effects of all face-up opposing cards upon summon, then Tributes all opposing Monsters if it was summoned by the effect of a Nouvelles Monster

It means that the sets were always meant to be played together, in which case Magic: The Gatherings old block format of drafts, where you'd take two from one set and one from the other, would have been more logical