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Ghost-Spider is a good card advantage engine, but shes incredibly expensive to get online, and isnt worth the mana invested

Constellation Even though Im not a full-blown enchantment deck, I do have a fair number of enchantments and of course once Myrkul starts making non-creature enchantments these constellation triggers will add up

Of course, having access to reliable discard engines is a must (for there would be better four-mana clones otherwise)

Of course, you're also going to want to run a suite of removal, counters, and draw spells, but that really depends on your play style and the direction you plan on taking your deck