TRIBUTE SUMMON: A 6 cost or more —> Void After paying the traditional Summoning Core Cost, you must move all the Cores of a Spirit that meets these aspects to the location specified in order to summon this Spirit. When Summoned (Lv. 1-2-3): Exhaust all opposing Spirits. Also, if [SD01-026]"Yggdrasil the Iron Knghtlord" was sacrificed to Tribute Summon this Spirit, add 6 Cores from the Void to this Spirit. When in Battle (Lv. 3): Refresh three of your Spirits with a Core Cost of 8 or less.