: Target land becomes a 1/1 creature until end of turn. It's still a land.
: Creatures you control get +3/+3 and gain trample until end of turn.
Ramp into Kamahl, flood the board with lands and tokens, then use his second ability as a repeatable Overrun to swarm the table for lethal damage in one turn. Early turns are spent ramping and developing mana, midgame you protect Kamahl and build a wide board, then you alpha strike.
Repeatable, mana-positive Overrun effect that turns any wide board into a kill
First ability animates your own lands into attackers and can also create blockers/removal fodder
Plays well in mono-green's strong ramp shell, hitting the activation cost easily
Can win out of nowhere once enough mana is online
Six mana for a commander that does nothing the turn he enters without extra mana
Highly vulnerable to board wipes and spot removal aimed at him
Mono-green struggles with interaction, card advantage, and answering noncreature threats
Animating lands into 1/1 creatures exposes them to Wrath effects and edicts