If a permanent has multiple instances of soulshift, each triggers separately.
June 14, 2019 · Modern Horizons
You can’t choose to use a splice ability if you can’t make the required choices (targets, etc.) for that card’s rules text. You can’t splice any one card onto the same spell more than once. If you’re splicing more than one card onto a spell, reveal them all at once and choose the order in which their effects will happen. The effects of the main spell must happen first.
May 3, 2019 · War of the Spark
You can’t choose to use a splice ability if you can’t make the required choices (targets, etc.) for that card’s instructions. You can’t splice any one card onto the same spell more than once. If you’re splicing more than one card onto a spell, reveal them all at once and choose the order in which their instructions will be followed. The instructions on the main spell have to be followed first.
January 25, 2019 · Ravnica Allegiance
You can't choose to use a splice ability if you can't make the required choices (targets, etc.) for that card's instructions. You can't splice any one card onto the same spell more than once. If you're splicing more than one card onto a spell, reveal them all at once and choose the order in which their instructions will be followed. The instructions on the main spell have to be followed first.
February 1, 2014 · Born of the Gods
You can’t choose to use a splice ability if you can’t make the required choices (targets, etc.) for that card’s instructions. You can’t splice any one card onto the same spell more than once. If you’re splicing more than one card onto a spell, reveal them all at once and choose the order in which their instructions will be followed. The instructions on the main spell have to be followed first.
July 13, 2013 · Magic 2014
You can't choose to use a splice ability if you can't make the required choices (targets, etc.) for that card's instructions. You can't splice any one card onto the same spell more than once. If you're splicing more than one card onto a spell, reveal them all at once and choose the order in which their instructions will be followed. The instructions on the main spell have to be followed first.
September 30, 2011 · Innistrad
The permanent is sacrificed at the same time the spell is announced (see rule 601.2a). The total cost of the spell is reduced by the sacrificed permanent's mana cost (see rule 601.2e).
June 17, 2011 · Commander 2011
The permanent is sacrificed at the same time the spell is announced (see rule 601.2a). The
February 4, 2011 · Mirrodin Besieged
The card with ninjutsu remains revealed from the time the ability is announced until the ability leaves the stack.
October 1, 2010 · Scars of Mirrodin
The card with ninjutsu remains revealed from the time the ability is announced until the
February 1, 2010 · Worldwake
The card with ninjutsu remains revealed from the time the ability is announced until the ability leaves the stack.