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Still, its playable in decks that want the effect

Here is a rules breakdown, with Xenograft as an example

Each additional Hardened Scales you control will increase the number of +1/+1 counters placed on a creature you control by one

Legality depends on the tournament format -- Martyr's Cause can be legal in some formats and banned or restricted in others

As pointed out by Spencer in the comments, Fat Packs are generally thought to be printed in a single wave up front and therefore significantly more limited than Booster Boxes

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