Hisotyr, Legacy of Dragons

{t}{x}{u}{b}{r} Put X -1/-1 counters on Hisotyr and lose X life. You may cast spells with mana value less than or equal to X without paying their mana costs until end of turn.
Dragon spirit — Hisotyr's power and toughness are equal to the number of Dragons you control plus the number of Dragon cards in your graveyard.

Don't split the party (You can have four commanders if they all have Don't split the party)