Since this card's Summon will always be a Special Summon, Tribute it for "Great Maju Garzett" to create a monster with 8400 ATK in one turn (which, if it attacks anything with less than 400 ATK or directly, will result in a OTK).
This card can be Summoned easily by banishing "Des Kangaroo" and "Big Koala" while "Fusion Gate" is on your field.
Using "Wild Nature's Release" on this card is almost an assured victory if the field is clear enough to make the attack. Note that "Master of Oz" would have 7900 ATK, exactly 100 less than an OTK, so the opponent's Life Points must have already be lowered, or attack with another monster.
Because "Wild Nature's Release" destroys your monster, "De-Fusion" is also useful here, in case the first attack fails to win the Duel.
This card is comparatively easier to Summon for a monster with such a huge ATK compared to any other monster (any monster with a comparable ATK either has Summoning restrictions, multiple Tributes, or which require more than 2 Fusion Materials).