Amass abilities are now written as "amass [subtype] N." Previous cards with amass have received errata to say "amass Zombies N."
Dunland Crebain
To amass Orcs N, if you don't control an Army creature, create a 0/0 black Orc Army creature token. Then you choose an Army creature you control and put N +1/+1 counters on it. If that Army isn't already an Orc, it becomes an Orc in addition to its other types.
In the rare case that you control multiple Army creatures (perhaps because you played a creature with changeling) while you amass Orcs, you choose which of your Army creatures to put the +1/+1 counters on. If that creature isn't an Orc, it becomes an Orc in addition to its other types.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Alexander Ostrowski
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