Eater of Days only belongs in decks that want you to give away your own cards, but you have to do it in a way to trigger the enters ability to make your opponent skip two turns
Step 1: Choosing a Deck Type Before you start putting cards in your deck, you need to know your deck type
Eldrazi Incursion and Eldrazi Incursion Collector's Edition 0004_MTGMH3_CmdFace: Ulalek, Fused Atrocity 0005_MTGMH3_CmFeatur: Azlask, the Swelling Scourge 0147_MTGMH3_Vanity: Ulalek, Fused Atrocity 0143_MTGMH3_ComPorEc: Ulalek, Fused Atrocity 0136_MTGMH3_ComPorEc: Azlask, the Swelling Scourge 0151_MTGMH3_EclVanty: Ulalek, Fused Atrocity Check out the cards from Eldrazi Incursion and Eldrazi Incursion Collector's Edition in the Modern Horizons 3 Card Image Gallery
This has a tap ability for nothing else, to sacrifice a dork for Black mana equal to its mana cost
Only being able to tap a Frog for Blue or Green isn't much of a drawback, as this brew will be skewed quite heavily towards those two colors