, 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.
You don't count how many +1/+1 counters are on Goblin Razerunners until its triggered ability resolves.
2009-02-01 • wotc
If Goblin Razerunners leaves the battlefield after its ability triggers but before it resolves, the amount of damage it deals is equal to the number of +1/+1 counters that were on it as it last existed on the battlefield.