Amass is a mechanic that originally appeared in War of the Spark and is now making a return in Lord of the Rings: Tales of Middle-earth, but with a bit of a twist: this version is called Amass Orcs, and the armies you amass are made up, fittingly enough, of orcs.
It will always be written with a number next to it, so Amass Orcs N. When you trigger the ability, if you control a creature with the type Army, it gets N +1/+1 counters and becomes an Orc in addition to its other types. If you don’t control an Army, you create a 0/0 Orc Army token creature and put N +1/+1 counters on that instead.
That’s pretty much it. If you control multiple Army creatures (usually only really possible with Changelings), you choose which Army gets the counters as the ability resolves. Also, the old version of Amass is getting updated to be Amass Zombies and now adds Zombies to the Army’s type line if it wasn’t there already. Everything else about it remains the same.
This update to Amass does open the door to it appearing in more places than it had before – while Orcs existed in Magic already, they were pretty scarce relative to the more prevalent goblins, and the old version of amass required a zombie-heavy setting. But now that Amass can, well, amass armies of different creature types, it can appear nearly anywhere.
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