Briarbridge Tracker and Bloodtithe Harvester are the creatures in the deck, and both pair well with (once again) Fable of the Mirror Breaker
Wyleth, Soul of Steel generates a ton of free draw off of your equipment, and Galea, Kindler of Hope can help you skip those prohibitive costs
Mondrak, Glory Dominus has a similar effect and has seen regular play since its release in Phyrexia: All Will Be One, thanks in no small part to the ease with which it can be granted Indestructible
In fact the printing of Unholy Heat (and to an extent Solitude) has mostly pushed out cards like Tarmogoyf out of the format, as the removal in the format is now so efficient that creatures either need to be one-mana, so you trade at an even level (Dragons Rage Channeler and Ragavan, Nimble Pilferer), too large to be killed by Unholy Heat (Deaths Shadow and Murktide Regent) or generate immediate value upon being played (Solitude, Fury and Omnath, Locus of Creation)
I considered playing a second Pyrite Spellbomb instead, as a lot of the time you want Pyroclasm, youre only really trying to kill one creature, and its relatively painless to draw when its bad instead of completely blank