By using Hazy Flame Sphynx' effect along with Mai's Aroma Strategy, you can correctly declare the card type at the top of your deck. By doing this, you can Special Summon Hazy Flame Hyppogrif from your Hand or Graveyard since it's a FIRE monster. You can special summon FIRE monsters on each of your turn and Hazy Flame Hyppogrif can tribute those monsters to further increase its attack.
Tributes for cost
Cannot be targeted by card effects
This card gains ATK
Whether it's tribute from the field or from the hand for hyppogrif 300atk