Astral Dragon, Everquill Phoenix, Phyrexian Altar, and Arcane Adaptation

Prerequisites

• Astral Dragon in hand
• Everquill Phoenix in hand
• Phyrexian Altar on the battlefield
• Arcane Adaptation on the battlefield
• available

Steps

1. Cast Everquill Phoenix for its mutate cost by paying , mutating it over or under a non-Human creature you control
2. Everquill Phoenix triggers, creating a Feather artifact token
3. Cast Astral Dragon by paying
4. When Astral Dragon enters the battlefield, it triggers, creating two copies of the Feather token that are 3/3 Dragon creatures
5. Activate Phyrexian Altar by sacrificing Astral Dragon, adding
6. Activate a Feather by paying and sacrificing it, returning Astral Dragon from your graveyard to the battlefield
7. Repeat from step 4

Results

• Infinite LTB
• Infinite ETB
• Infinite colored mana
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite creature tokens
• Infinite creature token copies of all noncreature permanents
• Infinite recursion of creature cards in your graveyard