Null Rod stops activated abilities of artifacts, so it shuts off Lotus Petal's sacrifice-for-mana ability, which blunts their explosive starts. It does nothing to Chalice of the Void, whose counter effect is a triggered ability, not an activated one. Null Rod also turns off our own Mishra's Bauble and Cori-Steel Cutter's equip, so use it carefully. Meltdown with X=0 is enough to wipe their Lotus Petals and Chalice of the Void (a Chalice on the battlefield has mana value 0) before it locks us out of casting spells. It will also destroy our own Mishra's Baubles. Unholy Heat stays in: it kills their 2/2s (Glaring Fleshraker, It That Heralds the End, Wastescape Battlemage) for one mana, and with Delirium it deals 6 damage, enough to kill even the 5/5 Reality Smasher and the 4/4 Thought-Knot Seer. We cut a Mishra's Bauble, which Null Rod and Meltdown both hurt, along with Boomerang Basics. Keep Wasteland in to attack their Eldrazi Temple and Cavern of Souls, which are vital to their curve.