If there is no Lesson card in your graveyard when Walltop Sentries dies, the ability will not be put on the stack at all
Snow White isn't solely a princess though
On its own, I could potentially see trying to use this card as a starter type Pokemon in a Psychic type deck
Although some of his Amber cards play into OP Disney Lorcana combos, Stitch: Abomination is a more straightforward endeavor, delivering all-around good stats at a cost of 6 ink
Whenever a nontoken creature you control dies Bane returns it to your hand unless an opponent chose to let you draw a card instead
Bracers are the next logical step, and by utilizing Battlemages Bracers or Illusionists Bracers, you can copy the damage ability, netting you way more damage than you thought possible