Mews ability to copy moves for the cost of three random energies makes its performance heavily reliant on your opponents lineup
If their Deck gets replenished (e.g., from Super Rod ), they must draw on their next turn
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Previously, when you hit a card with a lesser mana value with cascade that had two sides or two separate casting costs, you accepted the lower value and were able to cast either half because the rule simply said, you may cast that spell without paying its mana cost. With the update, you can only cast the part of the card that has a lower mana value than the card you cascaded with
Ive seen it show up in the occasional Thopter Control deck in Modern as well as in Modern Enduring Ideal, but not often
Phyrexian Metamorph A 3-mana Clone would be perfectly fine