This is because the goal is to copy abilities to "stack shenanigans", which is what is stated in Card Kingdom's blog post about their ideal upgrades and cuts
It is based on the new archetype of Despia, which are dark fairy monsters that can manipulate the fusion mechanic and summon powerful fusion monsters from the extra deck
This means they should be mostly sorceries, of which there are a lot more of
(It cant be blocked, targeted, dealt damage, enchanted, or equipped by anything with that quality.) Elspeth shone like a sixth sun, inspiring hope in the Mirrans and terror in New Phyrexia
It can also do some work in power-matters decks or those that have high mana value Creatures
The modern-day game is, however, a little different with the deck leaning on a combination of overwhelming numbers and an anthem buff to provide efficient damage in order to provide a clear path to victory