Going straight from 3 mana to 6 the next turn after you play a land lets you rocket out some terrifying beaters like Hellkite Tyrant and Ancient Copper dragon quite early, and you can run blacks cheap graveyard tutoring like Buried Alive or Entomb to gain easy access to a variety of threats
Creature - Wizard Eldrazi Creature (CTRL to add secondary) Enchantment Echoes of Eternity If a triggered ability of a colorless spell you control or another colorless permanent you control triggers, that ability triggers an additional time
If a creature with an aura is destroyed, the aura goes to the graveyard with the creature
But if your deck supports the theme, perhaps because of a commander like Kalamax, the Stormsire, its an invaluable investment that takes over games in short order
Any monocolored legend with "choose a background" can pick up a secondary color from their chosen background, which also acts as a static enchantment to grant new abilities