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Gauge the situation and consider which one to prioritize activating

The Metamorph can literally go in any deck although blue is its favourite home as casting is more flexible and artifact synergy is highest

UR Ultra Rare Gouki Thunder Ogre X EARTH Link 3 [ WarriorLinkEffect ] ATK 2200 DEF - 2+ "Gouki" monsters If a monster(s) this card points to is destroyed by battle or card effect: You can make this card gain 400 ATK

Instead of aiming all the damage at one creature, you can damage each token instead

Green, blue, and white have lots and lots of defenders, and there are also artifact defenders (sorry Vent Sentinel