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
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
You can't use Cloud's second ability to try to attach an Equipment to Cloud if that Equipment can't legally be attached to Cloud
This has a tap ability for nothing else, to sacrifice a dork for Black mana equal to its mana cost
If I play my Phoenix face down as a morph creature, and it gets killed (say, by a Lightning Bolt), what happens next