I added some counter spells since in fighting games you can counter an opponent's attack, added in some additional combat phase effects to get in extra damage, and then filled it out with general good Commander spells
Gain control of target noncreature spell
Julius Jumblemorph Eladamri's Call Eladamri's Call Karametra, God of Harvests Knight of the Reliquary Nazahn, Revered Bladesmith Pale Recluse Supply // Demand
Cloud, Midgar Mercenary Rarity: Mythic Rare TYPE: Legendary Creature SUBTYPE: Human Soldier Mercenary CMC: 2 Mana cost: USD: $20.19 EUR: 20.99 TIX: 0.39 EDHREC RANK: 1787 (2/1) When Cloud enters, search your library for an Equipment card, reveal it, put it into your hand, then shuffle
Unlike damage-based sweepers, reducing toughness to zero causes creatures to die as a state-based action, making this the definitive answer to problematic indestructible threats that dominate late-game boards