Can be discarded to Special Summon “Gusto” monster from your Deck
Weak ATK and DEF stats
Gusto Griffin’s discard condition disregards whether its for cost of activation or its due to card effect. As long as it is sent to the Graveyard from your Hand, you can activate its effect.
You can discard Gusto Griffin to activate these cards respective effects, and then Special Summon 1 “Gusto” monster from your Deck. Cost Down could be particularly helpful, as there are some level 5 and 6 Gusto monsters.
You can Special Summon Windaar, Sage of Gusto, and use it effect to Special Summon Gusto Griffin to the Field from your Graveyard (after you discarded it previously). Reeze, Whirlwind of Gusto can use its effect to switch control of Gusto Griffin with your opponent’s stronger monsters.
Activates from your Graveyard
Special Summons from your Deck
Actually can add hallowed life barrier to the list