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Not at all bad, especially since the state of a board can shift dramatically over the course of 2 turns

Demonstrating the return of the constellation showcase, we have Heliod, one of the most iconic Legendary Enchantment Creatures, who was compleated during March of the Machine

Seeing as Grim Monolith is legal in all formats where it can be, its no surprise that this exceptional mana-producing artifact is worth close to $300 for a non-foil and a cool $2,000 for a foil copy

Im not sure I run this outside of such combos, though

Of course, theres example of printed cards that do both of those things and I cant stop you, but I would recommend avoiding it, or restricting it heavily if you do

It's best in multi-colored decks as it will discount the spell by two mana, assuming the spell has the two colors you named in its casting cost