Ketramose, the New Dawn Ketramose, the New Dawn requires more effort to build around than other options on this list, but it has access to so many cheap cards that easily wrack up triggers, like Ghost Vacuum and Relic of Progenitus
x2] [When Attacking] You may add 1 card from the top or bottom of your Life cards to your hand: Add up to 1 card from the top of your deck to the top of your Life cards
Unfortunately, its clear WotC doesnt want to use investigate as an evergreen mechanic for generating Clue tokens
Aurelia's extra combat phase shines in a deck with lots of attack triggers like Firemane Avenger or EDH oldie-but-goodie Etali, Primal Storm
Estimated 2015 retail value for Forged in Stone reprints, excluding bulk rares: $19 Peer Through Time Sapphire Medallion $10 Thran Dynamo $6 Stroke of Genius $5 Rite of Replication $3 Worn Powerstone $3 Nevinyrrals Disk $3 Sol Ring $3 Steel Hellkite -$2 Lorthos, the Tidemaker $2 Artisan of Kozilek $2 Cyclonic Rift $2 Fog Bank $1.50 Frost Titan $1.50 Deep-Sea Kraken $1.50 Everflowing Chalice $1.50 Ixidron $1 Ghost Quarter $1 Sphinx of Magosi $0.75 Sphinx of Jwar Isle $0.50 Phyrexian Ingester $0.50 Sphinx of Uthuun $0.50 Hoverguard Sweepers $0.50 Distorting Wake $0.50 Cackling Counterpart $0.50 Swiftfoot Boots $0.50 Infinite Reflection 0 $0.50 Peer Through Time contains three of my favorite long-term Commander specs: Ixidron, Rite of Replication, and Cyclonic Rift