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But, comparing this to many other two-mana choices shows a lot of upsides

Convergence of Dominion + Ghost Ark The more common one is Convergence of Dominion plus Ghost Ark: cheap activated abilities from the yard, plus unearth on your whole artifact army, and youre recycling the graveyard onto the board every turn

You cant pay the life for Phyrexian mana if your life total is at 1 or less in the same way that you cant pay life for anything else if that payment would drop your life total below 0

Its so easy to discard cards, which means that you can quickly get tons of powerful creatures onto the battlefield on 4/4 Zombie tokens

Each card can be in the deck a maximum of 4 times