Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to Gigantoad may become lethal if the number of lands you control drops below seven during that turn
If you pay the dash cost to cast a creature spell, that card will be returned to its owner's hand only if it's still on the battlefield when its triggered ability resolves
With the right deck, however, he could be absolutely devastating
Whispers in the Well has plenty of other interesting features, from retro characters from The Black Cauldron and Gargoyles to a detective subtheme and whisper cards that have art that fades at the edges with a neat weathered paper effect
And even then, you don't gain anything by exerting unless you can challenge into the exerted characters
Hades - Infernal Schemer (Enchanted) Laying my (Lorcana) cards on the table here, Hades - Infernal Schemer (Enchanted) might be my favorite card on this list