The deck supports this through a number of cards with high toughness (walls, etc) that are also strong defensive bodies
Kefka, Court Mage / Kefka, Ruler of Ruin Flickering Kefka, Court Mage over and over seems like a great way to deprive your opponents of resources
Storm, Force of Nature Storm, Force of Nature is designed for spellslinger decks that want one massive turn instead of slow, incremental value
On the other hand, Modal Double-Faced lands like Jwari Disruption occupy a unique space, but I typically consider them equivalent to one-third of a land
Sure, your opponent might have ten beasts in their green deck, but Callous Oppressor would still be able to steal their four goblins, three elves, and two other creatures that weren't beasts
Despite the high count, there's a lot of great reprints here: Bojuka Bog for free GY hate, Path of Ancestry is fantastic in tribal decks, and we have a whopping 7 lands that can enter untapped and tap for both colors of mana, which is the highest for a precon that I can think of