Thrumming Hivepool [Edge of Eternities Promo Pack]

Set: Edge of Eternities Promo Pack Type: Artifact Rarity: Rare Cost: {6} Affinity for Slivers (This spell costs 1 less to cast for each Sliver you control.)Slivers you control have double strike and haste.At the beginning of your upkeep, create two 1/1 colorless Sliver creature tokens. "I'll never escape this rock, but I fear they will." —Decrypted log 4.11