Silverfish

When Silverfish enters the battlefield, place a swarm counter on it set to 1, add 1 to the counter for each land on the battlefield. Silverfish's power and toughness are multiplied by the swarm counter.

You may pay {2} to infest. If you infest, remove 1 from the swarm counter and place an infestation token on target land. If Silverfish is destroyed, destroy all infested lands.