Fuse has you cast one spell with attributes from both halves. It's not in any deeper way like doing two things. See CR702.101a.
I now have a question for another guru. Are you allowed to cast fuse spells for free? Fusing isn't a choice of alternate cost, it's an election to let the mana cost "include the mana costs of both halves". But there are inconsistencies in the document version 2019-October-4; e.g., 702.101 Fuse says you choose fuse before the card goes on the Stack, but 601.2* says you move any spell to the Stack first. And explicit treatment of how fusing features in casting seems left up to a special case in 708. Split Cards.
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Fuse has you cast one spell with attributes from both halves. It's not in any deeper way like doing two things. See CR702.101a.
I now have a question for another guru. Are you allowed to cast fuse spells for free? Fusing isn't a choice of alternate cost, it's an election to let the mana cost "include the mana costs of both halves". But there are inconsistencies in the document version 2019-October-4; e.g., 702.101 Fuse says you choose fuse before the card goes on the Stack, but 601.2* says you move any spell to the Stack first. And explicit treatment of how fusing features in casting seems left up to a special case in 708. Split Cards.
You may cast a card 'fused' even if you are using an alternate casting cost. Because the majority of the time an alternate casting cost is also allowing you to cast it from somewhere that isn't your hand it doesn't come up often. But in the cast where you can cast a card in your hand without paying its mana cost, you can choose to have that card 'fused'
Your second point is a simple misunderstanding of what it means to propose to cast a spell.
601.2a To propose the casting of a spell, a player first moves that card (or that copy of a card) from
where it is to the stack.
Fuse gives you the option of proposing to cast the spell Turn, Bur, or TurnBurn. While a split card allows you to cast either Fire or Ice not FireIce.
So the decision you make to cast a split card 'fused' is simply the decision to propose the spell TurnBurn rather than either the spell Turn or Burn.
You don't move a split card to the stack and then decide which half is being cast, you propose which half is being cast and then move it to the stack. In the same way that the new adventures work. You don't move it to the stack and then decide if its a creature or the adventure, you propose to cast either Murderous Rider or Swift End.
Your second point is a simple misunderstanding of what it means to propose to cast a spell.
601.2a To propose the casting of a spell, a player first moves that card (or that copy of a card) from
where it is to the stack.
Fuse gives you the option of proposing to cast the spell Turn, Bur, or TurnBurn. While a split card allows you to cast either Fire or Ice not FireIce.
So the decision you make to cast a split card 'fused' is simply the decision to propose the spell TurnBurn rather than either the spell Turn or Burn.
You don't move a split card to the stack and then decide which half is being cast, you propose which half is being cast and then move it to the stack. In the same way that the new adventures work. You don't move it to the stack and then decide if its a creature or the adventure, you propose to cast either Murderous Rider or Swift End.
That is sensible entirely. I'm overlooking the labors of subrule (a) of Fuse for not a good reason. It does clearly say "[...] the player may choose to cast both halves of that split card rather than choose one half. This choice is made before putting the split card with fuse onto the stack."
Your deduction is built on concrete notwithstanding the above, even.
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I now have a question for another guru. Are you allowed to cast fuse spells for free? Fusing isn't a choice of alternate cost, it's an election to let the mana cost "include the mana costs of both halves". But there are inconsistencies in the document version 2019-October-4; e.g., 702.101 Fuse says you choose fuse before the card goes on the Stack, but 601.2* says you move any spell to the Stack first. And explicit treatment of how fusing features in casting seems left up to a special case in 708. Split Cards.
Awesome avatar provided by Krashbot @ [Epic Graphics].
Your second point is a simple misunderstanding of what it means to propose to cast a spell.
Fuse gives you the option of proposing to cast the spell Turn, Bur, or TurnBurn. While a split card allows you to cast either Fire or Ice not FireIce.
So the decision you make to cast a split card 'fused' is simply the decision to propose the spell TurnBurn rather than either the spell Turn or Burn.
You don't move a split card to the stack and then decide which half is being cast, you propose which half is being cast and then move it to the stack. In the same way that the new adventures work. You don't move it to the stack and then decide if its a creature or the adventure, you propose to cast either Murderous Rider or Swift End.
That is sensible entirely. I'm overlooking the labors of subrule (a) of Fuse for not a good reason. It does clearly say "[...] the player may choose to cast both halves of that split card rather than choose one half. This choice is made before putting the split card with fuse onto the stack."
Your deduction is built on concrete notwithstanding the above, even.
Awesome avatar provided by Krashbot @ [Epic Graphics].