If you control no monsters, or all monsters you control are "Gouki" monsters, you can Normal Summon this card without Tributing. If this card is sent from the field to the GY: You can add 1 "Gouki" card from your Deck to your hand, except "Gouki Riscorpio". You can only use this effect of "Gouki Riscorpio" once per turn.
Even though Riscorpio can ease his summoning cost, it is much quicker to Special Summon him with Suprex. Tributing Riscorpio with Twistcobra’s effect can boost the ATK of a Gouki monster by 2300, do this when your opponent targets Riscorpio with a negative effect.
Gouki Iron Claw can be discarded for an ATK boost and immunity to enemy effects. Gouki Face Change is a good way to revive a Gouki monster while also getting a search effect. Gouki Cage Match can be used for good searching and field presence but is very slow to activate.