They really don't interact. For delve you exile the cards in the graveyard after total cost has been determined, and each card exiled pays for 1 generic mana of the cost. So trinisphere would not apply at all to treasure cruise since it's cost is greater than 3 mana.
But I thought you'd have to pay the extra 1 or 2 if you fully delve Treasure Cruise, because Trinisphere affects the total cost to play a spell, and is therefore applied after all other cost-affecting effects.
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But I thought you'd have to pay the extra 1, because Trinisphere affects the total cost to play a spell, and is therefore applied after all other cost-affecting effects.
The Delve ability was recently reworded. This is how Trinisphere and Delve used to work. Delve was a cost reducing ability, so if you had 7 cards in your graveyard and an untapped Trinisphere was in play, if you exile 7, you pay 2U
Now, with Delve, every card you exile pays for 1 mana. Since the exiling of cards is actually paying the mana costs, when you exile 7 cards, you pay U
edit: another notable change for Delve is you may now only exile enough cards to pay the mana costs. For example, previously, if you had 40 cards in your graveyard and you cast Tombstalker, you were able to exile all 40 cards and pay BB. Now you may only exile up to 6 cards to satisfy the 6BB mana cost.
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http://sggamesandhobbies.com/
e-Mail: info@sggamesandhobbies.com
Phone: (267) 387-6719
1005 W. County Line Road
Hatboro, PA 19040
The Delve ability was recently reworded. This is how Trinisphere and Delve used to work. Delve was a cost reducing ability, so if you had 7 cards in your graveyard and an untapped Trinisphere was in play, if you exile 7, you pay 2U
Now, with Delve, every card you exile pays for 1 mana. Since the exiling of cards is actually paying the mana costs, when you exile 7 cards, you pay U
edit: another notable change for Delve is you may now only exile enough cards to pay the mana costs. For example, previously, if you had 40 cards in your graveyard and you cast Tombstalker, you were able to exile all 40 cards and pay BB. Now you may only exile up to 6 cards to satisfy the 6BB mana cost.
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http://sggamesandhobbies.com/
e-Mail: info@sggamesandhobbies.com
Phone: (267) 387-6719
1005 W. County Line Road
Hatboro, PA 19040