Forest

Loyal Guardian

Trample
Lieutenant — At the beginning of combat on your turn, if you control your commander, put a +1/+1 counter on each creature you control.

Guardian Augmenter

Flash
Commander creatures you control get +2/+2.
Commanders you control have hexproof.

Bastion Protector

Commander creatures you control get +2/+2 and have indestructible.

Flaming Fist

Commander creatures you own have "Whenever this creature attacks, it gains double strike until end of turn."

Plains

Anara, Wolvid Familiar

During your turn, commanders you control have indestructible. (Effects that say "destroy" don't destroy them. A creature with indestructible can't be destroyed by damage.)
Partner (You can have two commanders if both have partner.)

Bloodsworn Steward

Flying
Commander creatures you control get +2/+2 and have haste.

Judgment of Alexander

Prevent all damage that would be dealt to you this turn by sources your opponents control. Whenever damage from a creature is prevented this way, each commander creature you control deals damage equal to its power to that creature.

Keleth, Sunmane Familiar

Whenever a commander you control attacks, put a +1/+1 counter on it.
Partner (You can have two commanders if both have partner.)

Uril, the Miststalker

Hexproof (This creature can't be the target of spells or abilities your opponents control.)
Uril gets +2/+2 for each Aura attached to it.

Loyal Unicorn

Vigilance
Lieutenant — At the beginning of combat on your turn, if you control your commander, prevent all combat damage that would be dealt to creatures you control this turn. Other creatures you control gain vigilance until end of turn.

Command Tower

{T}: Add one mana of any color in your commander's color identity.

Kediss, Emberclaw Familiar

Whenever a commander you control deals combat damage to an opponent, it deals that much damage to each other opponent.
Partner (You can have two commanders if both have partner.)

Deflecting Swat

If you control a commander, you may cast this spell without paying its mana cost.
You may choose new targets for target spell or ability.