Finding themselves in a new and unexplored world, they immediately set it on fire.

Goblin Razerunners

{1R}, Sacrifice a land: Put a +1/+1 counter on Goblin Razerunners.
At the end of your turn, you may have Goblin Razerunners deal damage equal to the number of +1/+1 counters on it to target player.

{1}{R}, Sacrifice a land: Put a +1/+1 counter on this creature.
At the beginning of your end step, you may have this creature deal damage equal to the number of +1/+1 counters on it to target player or planeswalker.

Finding an unexplored world, they immediately set it on fire.

Neon Dynasty Commander

{1}{R}, Sacrifice a land: Put a +1/+1 counter on Goblin Razerunners.
At the beginning of your end step, you may have Goblin Razerunners deal damage equal to the number of +1/+1 counters on it to target player or planeswalker.

Battlebond

Duel Decks: Merfolk vs. Goblins

{1}{R}, Sacrifice a land: Put a +1/+1 counter on Goblin Razerunners.
At the beginning of your end step, you may have Goblin Razerunners deal damage equal to the number of +1/+1 counters on it to target player.