(All of this says nothing of the options for Commander, which is a whole other game of Triple Triad.)
You can use the mana generated by your mana elves to cast it and give your army a big Overrun effect
A colorless artifact, Sol Ring is playable in every single Commander deck, and unless you're deliberately trying to reduce the power of your deck, you should be using it too
Getting creature token generators out early is very helpful , as this will help you to start forming a battlefield to block incoming attackers while you work on setting up your battlefield.
Printed in beautiful double rainbow foil and marked with their own serial number, each card will receive only about 500 printings and can only be found in Collector Boosters
Now for the cost reduction portion, say you have two Treasures, you sacrifice both as part of the additional cost and Dargo needs just more to be cast