Unholy Heat is cheap interaction against Ragavan, Nimble Pilferer, Wild Nacatl, and Territorial Kavu, and it scales up with our graveyard-filling plan: with delirium it deals 6 damage, enough to handle even a fully grown Kavu or their larger threats. Obsidian Charmaw will usually cost its full five mana here, since none of their lands can produce colorless mana, so it is a slower top-end card. Its enter trigger can destroy a key nonbasic land like a fetchland or dual, and it provides a big flying blocker/attacker. Thoughtseize is removed since trading a card for a card against an aggressive low-curve deck that can rebuild through Quantum Riddler's extra card draw isn't efficient, and Mishra's Bauble is cut since card selection matters less than board interaction in a fast matchup.