Chandra, Flamecaller For , Chandra, Flamecaller enters with four Loyalty Counters and three abilities that help her generate pressure, control the battlefield, and keep your hand moving
Effects like Duress specifically interact with cards in your hand, and thats the only zone the game recognizes for discarding
Then we have a group of these like the recently printed enchantment that gives your stuff trample, draws when dorks of power four or more arrive instead of three, and you can draw when it ETBs
Urza, Chief Artificer is also a great Commander because while your deck is mainly focused on Colorless Artifact spells, you can also just play other Esper Commanders like Noctis, Prince of Lucis, Alela, Artful Provocateur, and Sharuum, the Hedgemon
So you can flip it up for a surprise 10 damage or keep it ready for the protection