Dakkon Blackblade

Dakkon Blackblade’s power and toughness are each equal to the number of lands you control.

Livonya Silone

First strike; legendary landwalk (This creature can’t be blocked as long as defending player controls a legendary land.)

Hazezon Tamar

When Hazezon Tamar enters the battlefield, create X 1/1 Sand Warrior creature tokens that are red, green, and white at the beginning of your next upkeep, where X is the number of lands you control at that time.
When Hazezon leaves the battlefield, exile all Sand Warriors.

Sol’kanar the Swamp King

Swampwalk (This creature can’t be blocked as long as defending player controls a Swamp.)
Whenever a player casts a black spell, you gain 1 life.