To determine the total cost of a spell, start with the mana cost or alternative cost (such as a harmonize cost) you're paying, add any cost increases, then apply any cost reductions (such as the cost reduction from tapping a creature)
French Charizard vs English: what is the price difference
3: Snapcaster Mage Snapcaster Mage is one of the most iconic cards in the game for a good reason
And they are way, way better than anything you can print out yourself
In fact, the cheapest variant of this card can be purchased for around $3
(If a monster with an A-Counter battles an "Alien" monster, it loses 300 ATK and DEF for each A-Counter during damage calculation only.) Alien Telepath X FIRE Level 4 [ ReptileEffect ] ATK 1600 DEF 1000 Once per turn, you can remove 1 A-Counter from an opponent's monster to destroy 1 Spell or Trap Card