You can substitute this card for any 1 Fusion Material Monster, but the other Fusion Material Monster(s) must be correct. You can Tribute Fusion Material Monsters on the field, including this face-up card; Special Summon 1 corresponding LIGHT Fusion Monster from your Extra Deck.
Can be treated as a substitute Fusion Material for a Fusion summon.
Can be used to Special Summon a corresponding LIGHT Fusion monster from your extra deck. This is not a Fusion Summon.
Versatility as a material in either Fusion and Special Summon.
Weak ATK stats.
You need to have this monster and another corresponding Fusion material on your Field, in order to use its Special Summon effect.
Although it is possible, it is not recommended to use this card to Special Summon 3-materials Fusion monsters like Blue Eyes Ultimate Dragon because you need the other 2 Corresponding Fusion materials on the Field. You can however, use Polymerization to Fusion Summon instead.
You can build a Fusion monster deck without relying on Fusion Summoning Support that takes up your card spaces.
2-Material Fusion Monsters
This card is an excellent substitute for UFOroid, and you only need another Warrior Type monster to Special Summon UFORoid Fighter. You can use this card with any Machine-type or Dragon-type monster to Special Summon Panzer Dragon. You can use X-Head Cannon and this card to Special Summon either XY-Dragon Cannon or XZ-Tank Cannon. You can use this card with another Dragon-type monster, to Special Summon Buster Blader the Dragon Destroyer Swordsman.
Since you are most likely to need to perform Fusion summon, you can use these cards to support your Fusion actions. Fusion Recycling Plant can recycle 1 fusion material monster to your hand, and also search for Polymerization from your deck. King of the Swamp can be treated as 1 fusion material required for Fusion Summon, and at the same time it also can be used to search 1 Polymerization from your Deck. Fusion Sage can search 1 Polymerization from your deck.
Doesn't work with most of the cards mentioned on this page. You can only use a Fusion Substitute in a Fusion Summon over named materials (and some monsters, like UFOroid Fighter have conditions preventing this), and it still needs to be a "correct" Material/be able to Substitute over a material for the Tribute effect as well.
This article is very wrong. It says it’s an “excellent substitute for UFOroid”... well, I tried it, and Uforoid Fighter’s atk and def became both 0. I was just fighting a lv20 CPU testing, but still, it was embarrassing.
Let me guess, you use the Hex's second effect (tribute to special summon without poly)?
That is not treated as Fusion Summon, just a regular Special Summon, as a result, UFORoid Fighter's ATK & DEF becomes 0 since it wasn't even fusion summoned to begin with, which means no fusion materials as a source for its ATK.