et sinon j'ai pas vu la reponse pour la question qu'on se posait :

j'ai 4 land artefact en jeux mon adversaire a trinisphere
je paye combien pour jouer ma mitraine ?

3, sous trinisphère tout coûte minimum 3. Sauf les sorts où l'on paye un coût autre que du mana - genre Force of will - car c'est un coût de remplacement.

Don Lopertuis

c'est pas ce que semble dire les arbitres

elle coutera trois à jouer. En effet, un rapide tour sur le gatherer de wizard :

Citation:

* 01/12/2004 Trinisphere's ability affects the total cost of the spell. It is applied *after* any other cost increasers or cost reducers are applied: First apply any cost increases. Next apply any cost reducers. Finally look at the amount of mana you have to pay. If it's less than three mana, you'll pay three mana. * 01/12/2004 Even with a cost reducer in play, spells can't cost less than three mana to play. * 01/12/2004 If a spell costs at least three mana due to additional costs, such as kicker costs, that's fine. * 01/12/2004 You still need to pay any additional nonmana costs the spell has, such as sacrificing a creature or discarding cards. * 01/12/2004 Playing a creature with morph face down already costs three mana, even though the converted mana cost of the face-down spell is zero, so Trinisphere normally doesn't modify the total cost of a face-down creature spell. However, if Dream Chisel is reducing that cost while Trinisphere is in play, you'll still have to pay three mana for the spell.

Ce qu'il faut en retenir, c'est que l'effet de trinisphère s'applique toujours en dernier. De fait un spell ne coutera jamais moins de trois [par un arbitre wotc]

ba oui