Parcelbeast Parcelbeast offers great value, and a 2/4 with card advantage abilities for is a great deal
You may play it without paying its mana cost for as long as it remains exiled
The economy of cards obviously goes up and down, but here are the most expensive in the set that are selling right now on eBay: Foil Thoughtseize $439.99 Foil Chalice of the Void $395.99 Foil Kiki-Jiki, Mirror Breaker $285.99 Foil Leyline of the Void $259.99 Foil Yawgmoth, Thran Physician $149.95 Foil Abrupt Decay $189.99 Foil Mystic Confluence $174.00 Foil Ponder $210.00 Foil Primeval Titan $139.99 Rarest Time Spiral Remastered Cards As you can tell above, the rarest, most expensive cards tend to be the foil versions of already powerful cards
Your clues can be sacrificed to their own effect, or to enable a card like Deadly Dispute, either way your Tireless Tracker will be gaining some counters
This will provide
Aether Hub, Harnessed Lightning, Glint-Sleeve Siphoner, and Whirler Virtuoso are all fine energy-based cards that can be played outside of a true energy sub-theme