Bruse Tarl gives Ishai a source of double strike out of the command zone, noted u/PhyrexianOilLobbyist a some years ago when discusing Ishai's optimal dance partners
For a larger collection, you may want to break it down even further (creatures, noncreature spells, and lands for example) if you are organizing to locate specific cards
Theres a deckbuilding challenge here, since you want to mix good activated abilities with ways to pump up Agatha, while also adding enough board presence to make Agathas own activated ability worthwhile
The most recent printing, not counting the 30th Anniversary Edition that we all try to forget exists, is from 2007s Tenth Edition: In addition to the awesome new art (using the term new loosely here), Im sure you also notice the totally reworked text box
"The duplicates perpetually gain "Mana of any type can be spent to cast this spell"." Juggle the Performance is one of 30 cards releasing on March 5 as part of Arena's Alchemy: Karlov Manor MTG set
Sanctum of Eternity is another way to redeploy Themberchaud without having it go to the command zone first
