At just two mana, she draws a card and gains a life every time you cast an enchantment, making her the most efficient enchantress engine available
14 toughness is a huge amount and being able to Mill more than 10% of someone's deck with one creature increases your clock massively
5 Jarad, Golgari Lich Lord + Jumbo Cactuar Send That Damage Right To The Face Attacking with Jumbo Cactuar makes him a 10,000/7, but for all that might, it can be blocked by a measly 1/1 token, and nothing will happen to all that damage
There arent enough of those cards to flesh out an entire theme yet, and they didnt even include many of the best cards that work in this space
The tutor is restrictive but in just Blue you can fetch creature removal (Pongify / Curse of the Swine), card draw (Pull from Tomorrow), countermagic (Counterspell), and of course, the mighty Cyclonic Rift