If an object has multiple instances of sunburst, each one works separately.
June 17, 2011 · Commander 2011
rule 702.44d not present in this release
February 4, 2011 · Mirrodin Besieged
Choose targets for the added text normally (see rule 601.2c). Note that a spell with one or more targets will be countered if all of its targets are illegal on resolution.
October 1, 2010 · Scars of Mirrodin
Choose targets for the added text normally (see rule 601.2c). Note that a spell with one or
February 1, 2010 · Worldwake
Choose targets for the added text normally (see rule 601.2c). Note that a spell with one or more targets will be countered if all of its targets are illegal on resolution.