You can play explore cards that let you hit your land drops more efficiently, it helps to play 3+ colors or expensive spells, it sets your graveyard for shenanigans, and much more
I tend to use Mental Misstep for late-game counter wars where it counters things like the elemental blasts, Veil of Summer, Dispel, Silence, and the like
Force of Will becomes Force of Negation, and a few other changes to the payoffs would likely result in a monstrosity that focuses on cheating Omniscience onto the battlefield to get the cast trigger from Emrakul, the Aeons Torn
Is Feign Death part of any infinite combos
Harvester of Misery And finally, we come to the most blunt instrument on my list
Weakness: Darkness (x2) Resistance: Fighting (-30) Retreat: 0 Safety Goggles - Trainer Pokemon Tool The Basic Pokemon this card is attached to has no Weakness