Summon: G.F. Cerberus (Borderless)

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after IV.)
I — Surveil 1. (Look at the top card of your library. You may put it into your graveyard.)
II — Double — When you next cast an instant or sorcery spell this turn, copy it. You may choose new targets for the copy.
III — Triple — When you next cast an instant or sorcery spell this turn, copy it twice. You may choose new targets for the copies.