Mana Echoes [Onslaught] 171 by having 5 or more

by having 5 or more DARK monsters in your Graveyard while you control no monsters

and it cannot be used as a Synchro Material Monster

Set: Gladiator's Assault Card type: Fusion/Effect Monster Rarity: Ultimate Rare Attack: 2100 Defense: 1200 "Elemental Hero Avian" + "Elemental Hero Burstinatrix" This monster cannot be Special Summoned except with ""Dark Fusion""

Set: Shadow of Infinity Card type: Effect Monster Rarity: Ultimate Rare Attack: 2400 Defense: 1800 This card cannot be Normal Summoned or Set

Mana Echoes [Onslaught] 171 by having 5 or moreSet: Onslaught Type: Enchantment Rarity: Rare Cost: {2}{R}{R} Whenever a creature enters the battlefield, you may add an amount of {C} equal to the number of creatures you control that share a creature type with it. When the ground is saturated with mana, even the lightest footstep can bring it to the surface.