As for Obliterate, normally I'd say that a board wipe is a card every player should have in their deck, but considering you have so many cards that force your opponents to sacrifice creatures I don't think its necessary to have it here
Banish 1 card on the field.
The complete Battles of Legend: Monstrous Revenge booster set contains*: 40 Secret Rares 62 Ultra Rares (More than 20 cards in the set also available as Quarter Century Secret Rares) *Set name and contents subject to change This all-foil booster set weaves a tale of knights, dragons, ghosts, and serpents, alongside cards for many different Decks seen in the Yu-Gi-Oh
Insidious Will offers three modes, but the middle one does what you expect it to
Tommy Muldoon and Carolyn Fern in particular have builds that enjoy being hit, and can use Walter again and again
Reshef of Destruction , while not featuring directly