what are next clan games rewards?
['Tier 1: 3000.', 'Rewards: Power Potion (x1), Clock Tower Potion (x1), Gold (20%)', 'Tier 2: 7500.', 'Rewards: Dark Elixir/Elixir (20%), Hero Potion (x1), Gems (x40)', 'Tier 3: 12000.', 'Rewards: Shovel of Obstacles (x1), Training Potion (x2), Research Potion (x1)', 'Tier 4: 18000.']