See Agenda 3 reads like this: [ a bunch of flavor text Im not going to type out ] Forced When this agenda advances: A.) If the Investigators are at Act 1, put the set-aside Ritual Site into play and spawn the set-aside Umordhoth there
You need to draw spells in large amounts and keep drawing them
Many spells return creatures to their owners' hands in blue, so to choose this one in particular, you are either playing +1/+1 counters in a UG deck, a blink deck, or both, and you get an excellent blue board wipe
Reflection of Kiki-Jiki copying an Eternal Witness on a turn-by-turn basis seems kind of fair if you're looping mediocre Saga cards, but you could loop anything in the deck if you plan ahead, so think bigger
More interested in pulling cards than buying singles
The static Goblin Formula ability allows you to cast cards from your graveyard by granting them Mayhem