The foil method used is even the same one used in MTG's Urza's Legacy set, further proving it is a genuine Wizards of the Coast product
Plus, it comes back to your hand when it dies, skirting around commander tax
In fact, the biggest change it brought, in comparison to the mechanics established in The First Chapter , was the introduction of a single keyword: Resist
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For example, if an effect has given Nylea's Colossus -8/-0 so that it's a -2/6 creature, doubling its power and toughness gives it -2/+6, and it will become a -4/12 until end of turn