mtg cards with imprint Chrome Mox - Artifact - Myr Welder has all activated abilities of all cards exiled with it. The Best-Selling Secret Lair MTG

Reckoner Bankbuster Similar to Mazemind Tome, Reckoner Bankbuster lets you use it even after the counters are expired

Since most foretell costs are cheaper than hardcasting, you find yourself in a spot where your floor is being forced to cast Cancel or Murder as normal and your ceiling is banking that spell for later, while firing off a (foretold, discounted) draw spell for maximum profit

Every box holds 100 double-sleeved Commander cards with room for tokens

Youre probably playing Lightning Greaves and Swords to Plowshares already, so add Crackdown Construct and you can gain life equal to the largest library and win on the spot

In terms of where he fits in the 99, Cadira, Caller of the Small is most likely the best fit for Finneas, at least thematically