Cassandra, King's Protector

Partner with Artowik, King's Destroyer.
As long as you control your commander, if it's your only commander, creatures you control get +1/+1 for each time you’ve cast your commander from the command zone this game.
As long as you control Artowik, King's Destroyer, Cassandra has "{t}: Cassandra deals 3 damage to up to two different target creatures and/or Planeswalkers.