M'rishka, Soul Keeper

When M'rishka, Soul Keeper enters play, create a Artifact called "Disk of Arnaine." Put it onto the battlefield.
{x}{u}{b}{p/b}, {t}; You may discard {x} cards,
if you paid 2 life instead of {b} to activate this ability, Draw four cards, and discard them all.
If you paid {b} instead of 2 life, You scry four instead.
Partner. (You can have two commanders if both have partner.)