mtg chaos commander deck Magic the Gathering: Incarnate Starter and a durable deck box ensures well The Best Chaos Commanders In

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1 Pact of the Serpent

This card is a little more niche than the other ones on the list because its ability relies on your deck utilizing the equipment mechanic

Linvala, Keeper of Silence on its own provides a similar effect but with less upside

However, even if this can hit attacking, blocking, and tapped creatures, it's inability to get a creature out of the way before it blocks, and the fact it can't deal with things with more than 4 toughness make it too restrictive to be great

K'rrik, Son of Yawgmoth is dangerous, turning all black pips on your spells into Phyrexian mana and growing as you cast them