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It only requires two Monsters on the field to Summon and gives immediate value if you use another Extra Deck Monster as material

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Then there are non-basic lands that will give you specific numbers, such as mizzium blast furnace which gives you two red each time you tap it

Fusion Summon 1 Fusion Monster from your Extra Deck, using monsters from either field

Once per turn, when a monster(s) your opponent controls is destroyed by battle or card effect: You can Special Summon 1 Wyrm monster from your Deck, in Defense Position, whose original Attribute matches the original Attribute that 1 of those destroyed monsters had on the field