Infernos power has to become exactly 20 for the trigger to happen, so if an opponent foolishly stacks a bunch of firebreathing triggers and you have a pump spell in hand, you can wait until Inferno hits around 18-19 power, pump it to 20 or above, and make it miss the damage altogether
Restricted : Ancestral Recall, Balance, Black Lotus, Braingeyser, Channel, Chaos Orb, Demonic Tutor, Library of Alexandria, Mana Drain, Mind Twist, Mishras Workshop, Mox Emerald, Mox Jet, Mox Pearl, Mox Ruby, Mox Sapphire, Regrowth, Sol Ring, Strip Mine, Time Walk, Timetwister, Wheel of Fortune
That generally provides enough core cards to have the deck function while adding a solid amount of variance
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There are artifacts that do both - Aetherflux Reservoir, and the upcoming Black Mage's Staff - but Artificer's Intuition can't find either of them