Combining this ability with the cost reduction found in artifact decks seems like a ton of fun
You may cast the creature later from exile.) This spell costs less to cast, where X is the number of cards in your graveyard that are instant cards, sorcery cards, and/or have an Adventure
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Now let the Minion Reflector triggers resolve on anything where we have no use for multiples (Vedalken Orrery, Phyrexian Altar, Hunted Lammasu, Holistic Wisdom, Mirror Gallery, Nature's Revolt) putting 2^2059 of each of them into play...which is to say 6*2^2059 mana of any colour in our mana pool
Writ of Return Writ of Return seems really underplayed, especially given how many EDH decks play the previous spell