4 Oct 2004
The player putting the copy spell on the stack controls that spell.
4 Oct 2004
The copy is a spell, so it can be targeted by other spells and abilities that target a spell.
4 Oct 2004
The spell copy has all the text and can result in itself being copied.
4 Oct 2004
The decision to tap or untap is made on resolution of the spell (and of each copy).
4 Oct 2004
Paying to make Chain Stasis continue is done as part of the resolution of the spell.