Dawnhand dissident + Soul cauldron
According to the card's text dawnhand dissident should allow you to cast any creature you exiled with it.
If you give it scavenging ooze's exile effect via agatha's soul cauldron and exile creatures it doesn't work despite it should given the card's wording. It was the dissident who exiled that creature even if it's scavenging ooze's ability
WeStillGoFace#65997
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Rezzahan#77802
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It doesn't work, because the Dawnhand's second ability and its last ability are linked abilities. Linked abilities only work with the ones they are linked to, not any others that may be gained and do something similar or even the same thing. You can only use the Dawnhand's last ability to cast cards exiled with the Dawnhand's second ability.
607.1. An object may have two abilities printed on it such that one of them causes actions to be taken or
objects or players to be affected and the other one directly refers to those actions, objects, or
players. If so, these two abilities are linked: the second refers only to actions that were taken or
objects or players that were affected by the first, and not by any other ability.607.2a If an object has an activated or triggered ability printed on it that instructs a player to exile
one or more cards and an ability printed on it that refers either to “the exiled cards” or to cards
“exiled with [this object],” these abilities are linked. The second ability refers only to cards in
the exile zone that were put there as a result of an instruction to exile them in the first ability.