mtg march of the machines commander decks ranked TCG Players are only allowed one of each card in their deck March of the Machine precon

Bloodgift Demon is just an extra Phyrexian Arena, which is pretty great

They're typically only helpful for intentionally stalling out battles to grind out more EXP/JP when you don't yet have access to a debilitating status effect move like Frog to cripple the last enemy

Progenitus The soul of the world has protection against everything , and it was the first time this expression was used on a MTG card

It also means that if you can make it leave and reenter, you can refill your hand with whatever you want

There is some additional value from the extra rares you open, and definitely more fun when you open something exciting