Rulings

• 2017-09-29
  For more information on double-faced cards, see the Ixalan mechanics article (http://magic.wizards.com/en/articles/archive/feature/ixalan-mechanics).
• 2017-09-29
  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 won't be able to remove those counters and transform it yet. You'll have to wait until you cast an instant or sorcery spell again.
• 2017-09-29
  Primal Amulet's last ability triggers once you've completed casting a spell. Notably, you can't use Primal Wellspring to pay for the spell that gives Primal Amulet its fourth counter.
• 2017-09-29
  To determine the total cost of a spell, start with the mana cost or alternative cost you'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.
• 2017-09-29
  Effects that reduce the generic mana cost of a spell can't reduce that spell's colored mana requirements.