So, assuming you have a sac outlet, you can respond to the trigger on Enduring Renewal. Sacrifice Karmic Guide, Enduring Renewal triggers. Respond to the trigger by sacrificing Reveillark. Reveillark and Enduring Renewal trigger. Resolve Reveillark first, targeting the Karmic Guide. Karmic Guide enters and triggers, target Reveillark. Reveillark enters, and the two Enduring Renewal triggers fizzle because the creatures are no longer in the graveyard. Rinse, repeat.
August 5, 2022 11:35 a.m.
Should add, if enduring renewal is milling Karmic Guide, that's still an Enduring Renewal trigger you can react to if you want, although you'll be getting the Guide back to hand anyway so it doesn't really matter.
August 5, 2022 11:42 a.m.
thanks for the clarification, im tempting a build at jeskai reanimation, beyond that i figured that it would come down to the stack. ill be using Herald's Horn and Sensei's Divining Top in an attempt to get around Enduring Renewal in the deck