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With two training grounds out and a spawnsire, you only have to pay 1 mana to create two eldrazi spawn. That means you can sacrifice one of the spawn to put out two more spawn, and so on, ad infinitum. It's colorless mana, but that's sure okay for artifacts and eldrazi. That creates a lot of options. Use the spawnsire's 20 mana option, or create a chalice of 10,000 mana, pump the steel hellkites infinitely high, or just kill the other player outright with a 300 mana red sun's zenith. Combos: Training grounds + Spawnsire = Two eldrazi spawn for 1 mana Training grounds + Spawnsire = Summon unlimited eldrazi from outside the game for 12 mana. Training grounds + Sphinx of Magosi = +1/+1 counter and a card draw for 1 mana Training grounds + Steel Hellkite = destroy all permanents of mana cost x (up to 9) for 1 mana
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