MTG Keyword Rules — Comprehensive Rules Glossary

Look up keyword abilities and keyword actions from the Magic: The Gathering Comprehensive Rules

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Amass

701.47 Keyword Action
701.47a

To amass [subtype] N means “If you don’t control an Army creature, create a 0/0 black [subtype] Army creature token. Choose an Army creature you control. Put N +1/+1 counters on that creature. If it isn’t a [subtype], it becomes a [subtype] in addition to its other types.”

701.47b

A player “amassed” after the process described in rule 701.47a is complete, even if some or all of those actions were impossible.

701.47c

The phrases “the Army you amassed” and “the amassed Army” refer to the creature you chose, whether or not it received counters.

701.47d

Some older cards were printed with amass N without including a subtype. Those cards have received errata in the Oracle card reference so that they read “amass Zombies N.”