The best Spell Speed 4 card is Super Polymerization
Given the strong cachet of The Abyss, and how much better it is at the kitchen table as well, (especially in a Commander metagame heavy with flyers), the fact that The Abyss is running under $250 for a played copy, and under $150 for an Italian copy is just beyond me
While other similar edict creatures exist, such as Plaguecrafter, Gatekeeper of Malakir, and Accursed Marauder, I consider Sheoldred a better card overall
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Bonus Bonus: River's Rebuke As *checks comments section* MANY of you have pointed out, this list left out River's Rebuke, so I'm editing it in to talk about it