Suppose there existed a spell with Convoke that also had an additional cost of untapping one or more tapped creatures you control. For this example:
Major Weirding
Sorcery
As an additional cost to cast Major Weirding, untap a tapped creature you control.
Target player discards a card and loses 1 life.
Convoke
If I control a single black creature, could this spell be paid for using only that creature?
The Comp Rules has this to say about paying costs:
Quote:
601.2h The player pays the total cost in any order. Partial payments are not allowed. Unpayable
costs can’t be paid.
costs can’t be paid.
It doesn't really truly go into detail about what that means. I mean, partial payment seems to mean you can't cast the spell by paying only part of the total cost. But what about the payment order? Like, do I have to pay all mana at once, or could I pay
, then untap a creature, then pay ? And if I could do that, what stops me from instead tapping my black creature to pay for through convoke, untapping that creature through the cost, and then tapping it again to pay for ? The total cost has been paid, and in an order of my choosing.Think of this as more of a question exploring whether something is capable of being done with Convoke and trying to figure out how disastrous such a spell could be (and thus whether it should be avoided entirely or come with very steep costs).