3 has potential as a spellslinger/burn commander, though it faces stiff competition from Valgavoth, Harrower of Souls and Tor Wauki the Younger
Getting one Treasure per rotation of the table, unless your opponent really wants to draw cards, isnt worth a four-mana investment
Swarms thrive in its nest, feeding on leathery bits of discarded wing
Are they usually all duds, except for standouts like the Eldrazi
Its also your only play against those pesky madness and cycling decks that actually want to discard cards
It just so happens that artifact creatures can go wide or tall, but either way you slice it, they are frequently used and made way more powerful with Krang on the board