Sets released: Morningtide, Shadowmoor, Eventide

Minor changes:

  - The abilities prowl, reinforce and kinship appeared in Morningtide;
    conspire, wither and persist in Shadowmoor and retrace in Eventide.

  - Shadowmoor introduced the untap symbol.

  - Shadowmoor introduced costs that are paid with a number of
    mana of any color or just one mana of a particular color, e.g.
    {2/B} can be paid as {2} or {B}.

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