Requires

Zask, Skittering Swarmlord must be on the battlefield. Mana Echoes must be on the battlefield. Needlebug must be in hand, or in the graveyard. Goblin Bombardment must be on the battlefield. You control at least two additional Insect creatures. Mana needed:

Steps

1. Cast Needlebug from your graveyard by paying .
2. Needlebug enters the battlefield, triggering Mana Echoes, adding at least .
3. Activate Goblin Bombardment by sacrificing Needlebug.
4. Needlebug dies, triggering Zask.
5. Holding priority, repeat from step 1 any number of times.
6. Resolve a Zask trigger, milling two cards.
7. Resolve a Goblin Bombardment ability, dealing 1 damage to any target.
8. Repeat the last two steps any number of times.

Results