Cheapest priced copy (Starter Commander Decks): $0.49 at Card Kingdom, near mint, their price list as of .
Lazotep Plating 
Instant · Uncommon · War of the Spark · #59
Amass Zombies 1. (Put a +1/+1 counter on an Army you control. It's also a Zombie. If you don't control an Army, create a 0/0 black Zombie Army creature token first.)
You and permanents you control gain hexproof until end of turn. (You and they can't be the targets of spells or abilities your opponents control.)
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $0.49 to $4.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The List | WAR-59 | Uncommon | $0.59 | — |
| Starter Commander Decks | 57 | Uncommon | $0.49 | — |
| War of the Spark | 59 | Uncommon | $0.59 | $4.99 |
8 rulings from Wizards of the Coast
- 3 May 2019If you create a Zombie Army token when Lazotep Plating instructs you to amass 1, that token will gain hexproof until end of turn.
- 3 May 2019You amass 1 and grant hexproof all while Lazotep Plating is resolving. Nothing can happen between the two, and no player may choose to take actions.
- 16 June 2023Amass Orcs works the same way, except you create a 0/0 black Orc Army creature token if you don't control an Army. If the Army creature you chose isn't already an Orc, it becomes an Orc in addition to its other types. By combining cards with amass Orcs and amass Zombies, you can end up with an Orc Zombie Army.
- 16 June 2023If you don't control an Army, the Zombie Army token you create enters the battlefield as a 0/0 creature before receiving counters. Any abilities that trigger when a creature with a certain power enters the battlefield, such as that of Mentor of the Meek, will see the token enter as a 0/0 creature before it gets +1/+1 counters.
- 16 June 2023To amass Zombies N, if you don't control an Army creature, create a 0/0 black Zombie 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 a Zombie, it becomes a Zombie in addition to its other types.
- 16 June 2023In the rare case that you control multiple Army creatures (perhaps because you played a creature with changeling) while you amass Zombies, you choose which of your Army creatures to put the +1/+1 counters on. If that creature isn't a Zombie, it becomes a Zombie in addition to its other types.
- 16 June 2023Some cards refer to the "amassed Army." That means the Army creature you chose to receive counters, even if no counters were placed on it for some reason.
- 16 June 2023Amass abilities are now written as "amass [subtype] N." Previous cards with amass have received errata to say "amass Zombies N."