You can only use 1 Shaddoll Dragon effect per turn, and only once that turn
Although it only has a single attack called Quartz Shine, it manages to deal a significant 200 points of damage to opponents, taking away a good chunk of their health points in one hit
The result is 25.8% roughly one game in four, the player will have access to a boardwipe from the opening hand

Kaalia of the Vast is the Commander, and heres the decklist out of the box: Creatures (29) 1 Mother of Runes 1 Serra Angel 1 Dragon Whelp 1 Fallen Angel 1 Anger 1 Bladewing the Risen 1 Reiver Demon 1 Furnace Whelp 1 Voice of All 1 Oni of Wild Places 1 Razorjaw Oni 1 Boros Guildmage 1 Angel of Despair 1 Orzhov Guildmage 1 Akroma, Angel of Fury 1 Oros, the Avenger 1 Duergar Hedge-Mage 1 Gwyllion Hedge-Mage 1 Malfegor 1 Lightkeeper of Emeria 1 Angelic Arbiter 1 Shattered Angel 1 Archangel of Strife 1 Dread Cacodemon 1 Kaalia of the Vast 1 Mana-Charged Dragon 1 Tariel, Reckoner of Souls 1 Basandra, Battle Seraph 1 Avatar of Slaughter Lands (38) Spells (33) 1 Sol Ring 1 Earthquake 1 Diabolic Tutor 1 Darksteel Ingot 1 Terminate 1 Akroma's Vengeance 1 Congregate 1 Lightning Greaves 1 Syphon Mind 1 Righteous Cause 1 Evincar's Justice 1 Orim's Thunder 1 Bathe in Light 1 Boros Signet 1 Cleansing Beam 1 Master Warcraft 1 Mortify 1 Orzhov Signet 1 Rakdos Signet 1 Wrecking Ball 1 Return to Dust 1 Sulfurous Blast 1 Pyrohemia 1 Path to Exile 1 Armillary Sphere 1 Comet Storm 1 Death by Dragons 1 Stranglehold 1 Syphon Flesh 1 Vow of Duty 1 Soul Snare 1 Vow of Lightning 1 Vow of Malice The concept behind the deck is pretty straightforwardattack with Kaalia of the Vast and put a huge Demon, Dragon, or Angel into play for free and attacking as well

While making a duplicate token might not do much in the grand scheme of things, giving them all +2/+2 can help push them over your opponents creatures
Since youre making so many tokens, and they all have trample, odds are pretty good that youll be able to connect and take the monarchy