Trample
When this creature enters, sacrifice it unless you sacrifice any number of creatures with total power 12 or greater.
(04/10/2004)
The sacrifices are simultaneous, not one at a time.
(15/04/2013)
If you are unable to sacrifice 12 power worth of creatures, then you cannot choose that option; in that case, you must sacrifice Phyrexian Dreadnought.
(15/07/2007)
If the Dreadnought is no longer on the battlefield when the triggered ability resolves, you may still choose either option.
(15/07/2007)
Reverted to its original wording, this now has an "enters" triggered ability. During resolution of the triggered ability, you choose one option or the other.
(04/10/2004)
Phasing in does not trigger "enters" abilities, so you don't have to sacrifice again if it phases in.
