This is attributed to him attacking with any of the multiple weapons he may have, which often includes the useless Excalipoor
Secret of Bloodbending Secret of Bloodbending offers two options: Either you control your opponents next combat step, or their whole turn
Nesting Grounds can move lore counters between Sagas, or just ditch a lore counter somewhere useless to 'rewind' a Saga to an earlier chapter, effectively letting you repeat the same chapters over and over
And then you can cast it from the Command Zone with haste and with flying it's a three-turn clock, and one power pump a 2 turn clock
Most Modern decks are overloaded with nonbasic lands, with means it's pretty realistic that on Turn 5, Anathemancer would be dealing at least four and maybe five damage per trigger
Pillar Analysis: Unique Effect (Sac Outlet/Life Gain), Scarcity (Legends, Reserved List), High-Grade Rarity