Back when I was trying to put together my foil Cube in 2009 and 2010, it was easy enough to find things like Revised dual lands and Gaeas Cradle as long as I was willing to pay the price
To make the math simpler, lets say that the average value comes out to $300
The final ability is to slot a shield counter onto a creature you control, like the Titan of Industry on a naked board or your Commander
Its value has since dropped slightly, but still ranges between 250,000 and 350,000, depending on the auction and timing
Might I suggest the latter with a deathtouch Commander in Rakdos since just two colors should let you have a bunch of Mountains to pump since first strike is nasty with it, like the commonly played Prosper, Tome-Bound
$70 cards arent really in my wheelhouse in terms of cards I can validate purchasing) and started considering building decks around the powerful one-mana spell