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Dinosaurs are often aggressive, high-power/toughness creatures with combat on the mind

They reprinted Exquisite Blood in a Commander precon (technically it was in Jumpstart (2020) and added to The List that same year, those are not reliable ways to obtain a copy and are a clear reason why Bloodthirsty Conqueror is a chase card from Foundations )

To make the discount worthwhile, you need to have this apply to almost all your other cards and then cast a flurry of spells in the same turn

If we basically just mash all the different builds of Deaths Shadow together without cutting anything, I can imagine that it might be the best build

Yes, there would be a bit of enchantment removal here and there, but most of that was in the sideboard and never really added many counters