Spontanzauber
Tappe oder enttappe eine Kreatur. Wenn die Kettenstarre eine Kreatur tappt oder enttappt, kann der Beherrscher der Kreatur 2U bezahlen, damit die Kettenstarre irgendeine Kreatur seiner Wahl tappt oder enttappt.
The spell copy has all the text and can result in itself being copied.
The decision to tap or untap is made on resolution of the spell (and of each copy).
Paying to make Chain Stasis continue is done as part of the resolution of the spell.
The player putting the copy spell on the stack controls that spell.
The copy is a spell, so it can be targeted by other spells and abilities that target a spell.