Sandstone Needle enters tapped with two depletion counters on it. {T}, Remove a depletion counter from Sandstone Needle: Add {R}{R}. If there are no depletion counters on Sandstone Needle, sacrifice it.
Saprazzan Cove enters tapped. {T}: Put a storage counter on Saprazzan Cove. {T}, Remove any number of storage counters from Saprazzan Cove: Add {U} for each storage counter removed this way.
Saprazzan Skerry enters tapped with two depletion counters on it. {T}, Remove a depletion counter from Saprazzan Skerry: Add {U}{U}. If there are no depletion counters on Saprazzan Skerry, sacrifice it.
Subterranean Hangar enters tapped. {T}: Put a storage counter on Subterranean Hangar. {T}, Remove any number of storage counters from Subterranean Hangar: Add {B} for each storage counter removed this way.