You can also go and find it pre-emptively (whenever your Saga goes off) and still have it around for when its needed
Players can respond to Processing Plant's second ability as normal, but once it starts resolving and you decide whether to put a card from exile into its owner's graveyard, it's too late for anyone to respond
Whenever you came to the game, whichever variant of a blue 1/1 that cant be blocked you prefer, they serve the same role: cheap bodies to exploit cards like Edric, Spymaster of Trest that reward you for dealing combat damage or a place to slap counters, equipment, auras, and whatever else you want to buff your army with
Become an Illumineer and use your Ink to summon Disney's most famous faces and songs to quest for Lore
Im curious to see whether Planisphere can actually take the place of Cori-Steel Cutter in that type of deck, or if it simply ends up competing for that key two-drop artifact slot