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Abyssal Harvester is worth noting as another demon to pair with Unholy Annex, but I think not having decent stats or a powerful enter the battlefield ability make it just not good enough

4 bodies for the price of 1 is even nicer when you can sacrifice the tokens to get some of the mana back

Everything from new artifact synergies using the Warp to massively powerful voids tearing open the battlefield seems to be on the table for this set

It started as a "demonic" tutor on Theros (you can see above that we restricted the tutor and then moved it into white to allow us to get Ephara on the back face)

It does lose the ability to tap for mana if you do this, but since the name changes, you can play another Irencrag and both the mana rock and Equipment will remain on the battlefield despite being the same card