mtg cards like drannith magistrate Your opponents cant cast spells from anywhere other than their hands. Drannith Magistrate #A - #1

The Sideboard The cards in our sideboard are designed to do three things: help improve our matchup against aggressive creature decks (by far our worst matchup), fight three-mana planeswalkers (especially Teferi, Time Raveler but also Narset, Parter of Veils and Oko, Thief of Crowns), and answer graveyard-based decks (which we actually help by filling their graveyard with our mill spells)

Another angle are the WotC-designed eldrazi spawn and scion tokens that you create through cards like Pawn of Ulamog, Basking Broodscale, and Awakening Zone

One of the five Commander decks released alongside Streets of New Capenna is the Cabaretti Cacophony deck

These effects address two of the most crucial weaknesses of Voltron decks: an inability to focus on multiple targets and an inability to recover well after the Voltron creature itself is removed

Or maybe you have a Cube that can use some of the cards you opened in Mystery Booster packs