mtg phyrexia all will be one commander deck corrupting influence Phyrexia: Deck: unbeatable prices! ONE] Corrupting Influence Precon Speculation

The card you leave in your graveyard could be as simple as a huge haymaker like Jin-Gitaxias, Core Augur

Not all creature types are equally supported, though

A must-have for any equipment-themed EDH deck

Kraum, Ludevics Opus [Best Anti-Spellslinger Threat] Kraum, Ludevics Opus applies steady pressure while quietly generating value

In other words, if the rest of your hand is full of cheap and inkable cards, Marshmallow isn't the worst thing in the world to keep

In this case, the spell side provides an infinite-hand-size emblem while drawing you lots of cards, and the Sea Gate, Reborn side is an untapped mana source if needed early on