Mono-Green, like the other Mono Colored decks, has access to staple cards that normally wouldn't be played in a multi-Colored deck, and would go under the radar otherwise
Summary Combo decks always fire cantrips on Turn 1
When this Siege enters, look at target opponent's hand
You won't at all be surprised to hear and see that one of the first cards shown off from the set features Sephiroth coming down from the heavens, sword in hand, ready to stab you-know-who just offscreen, which is of course morbid as hell, but makes for some pretty great card art at the very least
But the increased availability of cards also meant that fewer cards were rare
You can pair this with For Mirrodin