Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to a creature may become lethal if Amphibian Downpour becomes attached to it during that turn
While they can't quest for the rest of the turn, they can challenge opposing cards
Only appearing in one Foundations Jumpstart theme, Aphelia is bound to be fairly rare, which should keep their price high
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if your spell gets countered, you wont draw the card, but the upside is that enchantments are harder to remove
I will then finish off by pulling a deck from EDHREC's deck generating feature and discuss how that deck would fare in the variant