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Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to a Dragon you control may become lethal if Call the Spirit Dragons leaves the battlefield during that turn

This structure continued for two years

In EDH, there are decks that are crying for another copy of Impact Tremors, and Warleader's Call is it

If your opponent is running an aggressive deck, then from here on out, you'll want to carefully gauge whether you can survive their next turn

In general, the deck is looking to survive the first few turns by stopping others win attempts, then grind value with creatures or powerful enchantments like NecropotenceNecropotence until it's acquired enough mana and cards to go for a win, often at instant speed

We have a callback to this in Time Spiral with Evil Eye of Urborg