It involves copying your creatures and using energy counters to let them stick around (or, in some cases, letting them die to take advantage of death triggers)
But dont be too hasty to cash in those Treasures
Ashnod's tends to lean slightly more in the combo direction with Phyrexian being a bit more generally useful
Something like having a 5 mana scry for 2 on a land would rarely be activated and thus rarely worth it over the basic land unless it had no drawback at which point it would see play everywhere with no reason not to
It's simple: all of your creatures and lands are separate, but you each share the same 30-point life total and take your turns simultaneouslyplus you can block for each other too
One of them set a new world record for the most expensive Pokmon card ever sold, with the winning bid reaching $369,000 USD, while another one surfaced in January this year and ultimately went for $350,100 USD