The trade-off of using a tapped land likely rules this out of aggressive decks, butthat doesnt mean its unplayable
I love permanent spells with flash and I love artifacts that you can grab with Urza's Saga
Normal Magic decks will naturally create inefficient moments where you spend a three-damage spell on a one-toughness creature, so you need to force energy decks to deal with some occasional inefficiency by design
Of course, the reality is a bit more muddled when black can kill creatures easier, green can destroy artifacts and enchantments, red can deal with lands, and blue can bounce almost anything for a temporary removal
Look at sweet Piglet with a set of armor made of a colander and spare pieces of wood held together by rope
The Broodmoth brings Boromir back, but Solemnity stops the flying counter, and lets you activate Boromir again