At the beginning of your upkeep, if you control five or more lands, put four +1/+1 counters on Scute Mob.
"Survival rule 781: There are always more scute bugs." —Zurdi, goblin shortcutter
Official Rulings for Scute Mob
10/1/2009 : Scute Mob's ability has an "intervening 'if' clause." That means (1) the ability won't trigger at all unless you control five or more lands as your upkeep starts, and (2) the ability will do nothing if you control fewer than five lands by the time it resolves.