For example, if you discard a card to cast Tormenting Voice, then copy it with Reverberate, you do not need to discard and additional card for the copy, since you're not casting it
In fantasy, its important to establish the stakes, what will be lost if the grand adventure fails
If you want to look at the big picture, you can check out this spreadsheet with the names, prices and printings of these cards
Creature Spirit Uncommon Seb McKinnon 1/1 NOT LEGAL Standard NOT LEGAL Future LEGAL Historic LEGAL Timeless LEGAL Gladiator NOT LEGAL Pioneer NOT LEGAL Explorer LEGAL Modern LEGAL Legacy NOT LEGAL Pauper LEGAL Vintage NOT LEGAL Penny LEGAL Commander LEGAL Oathbreaker NOT LEGAL Standardbrawl LEGAL Brawl NOT LEGAL Alchemy NOT LEGAL Pauper Commander LEGAL Duel NOT LEGAL Oldschool NOT LEGAL Premodern NOT LEGAL Predh Whenever a creature is exiled from the battlefield, put a +1/+1 counter on this creature
White excels at evasion through abilities such as flying or protection, so it should be pretty easy for you to win this battle and cast the spell on the back of the card