Quicksilver Gargantuan by paying its mana cost. Choose to have it enter as a copy of
Princess Yue.
Put
Quicksilver Gargantuan into your graveyard due to the legend rule.
When
Quicksilver Gargantuan dies, it triggers, returning it from your graveyard to the battlefield as a land named Moon. Choose to have it enter as a copy of
Astral Dragon, gaining its abilities.
When
Quicksilver Gargantuan enters, it triggers, creating two token copies of itself, thus creating two copies of Moon with
Astral Dragon's abilities, that are 3/3 Dragon creatures in addition to its other types.
Put all but one of the [[clones]] into your graveyard due to the legend rule.
The
Quicksilver Gargantuan tokens each trigger. Resolve a trigger, creating two token copies of itself, thus creating two copies of Moon with
Astral Dragon's abilities, that are 3/3 Dragon creatures in addition to its other types.
Repeat from step 5.
Notes
The additional triggers can copy whatever noncreature permanent(s) you desire.
Results
Infinite ETB.
Infinite LTB.
Infinite creature token copies of all noncreature permanents.