Either one is pretty good, and if you have any fetch lands in your deck, you're often going to be able to choose which you need more
The reason being is that if your opponent has some kind of answer for either Dumbo or your other evasive characters, you'll lose a ton of value
Naban, Dean of Iteration / Panharmonicon out, have Archaeomancer or similar creature, a flicker spell (for example Ghostly Flicker), Reality Shift and access to infinite mana: similar to the afromentioned Naru Meha Reality Shift line, we do the same but in this line we have two Archaeomancer (or similar) triggers, out of which one will return us Reality Shift back to our hand and the second will be a flicker spell, which we use to flicker the Archaeomancer to then produce two additional ETB triggers, returning both of the instants to our hand
This is another card I have a single copy of for my collectionI acquired it from Card Kingdom for something like $50 just a few months ago
Dice provide a fast and reliable method for managing life totals and counters
Someone is your friend and will stack them 3 and 0 for you so you can draw an Ancestral Recall amount of cards