Instant and sorcery spells you cast cost less to cast.
Whenever you cast an instant or sorcery spell, put a charge counter on Primal Amulet. Then if there are four or more charge counters on it, you may remove those counters and transform it.
John Avon & Jared Blando
For more information on double-faced cards, see the Ixalan mechanics article (http://magic.wizards.com/en/articles/archive/feature/ixalan-mechanics).
To determine the total cost of a spell, start with the mana cost or alternative cost youâ€™re paying, add any cost increases, then apply any cost reductions. The converted mana cost of the spell remains unchanged, no matter what the total cost to cast it was.
Primal Amuletâ€™s last ability triggers once youâ€™ve completed casting a spell. Notably, you canâ€™t use Primal Wellspring to pay for the spell that gives Primal Amulet its fourth counter.
If a fourth charge counter is put on Primal Amulet by something other than the resolution of its ability (as modified by any applicable replacement effects), you wonâ€™t be able to remove those counters and transform it yet. Youâ€™ll have to wait until you cast an instant or sorcery spell again.
Effects that reduce the generic mana cost of a spell canâ€™t reduce that spellâ€™s colored mana requirements.
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