Run "Divine Wrath" to support this card, since it's an easy way to discard it for dump and revive tactics, while also protecting this card from its worst enemy, "Effect Veiler" who could turn it into an ATK-less liability.
This card makes excellent Discard Fodder, since it can be retrieved easily for a +1 with "Recurring Nightmare".
"Magical Merchant" can help to mill the card beforehand, while giving you a chance to get "Recurring Nightmare" or another useful Spell like "Mystical Space Typhoon" to clear away the opponent's defenses.
"Jester Confit" works great with this as you can Special Summon "Jester Confit" then tribute it to Tribute Summon this card, then use "Recurring Nightmare" to repeat the combo if "Endless Decay" dies.
Special Summon this card, then return it to your hand for something like "Genex Ally Birdman" and re-Summon it for an easy Synchro Summon.
Using two or three of this card at once can garner enough ATK on the field to OTK with. This can be better attained with "Inferno Reckless Summon".