Cheap Stack Shenanigans

[FlyFlySideOfFry]

Prioritize -
Instant
Target spell resolves.
Some things are more important than others.

Time Fracture -
Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.)
Target spell gains split second.

I think these cards are pretty self-explanatory and simple. I can't think of any glaring rules holes and they both do what they're intended to do. Thoughts/comments?

[Matt]

Cute, but referring to the first one, what if the spell doesn't resolve? I'm thinking of a spell with no legal targets.

[Oath of Happy]

Well the second one trumps the first one in every way.  It's way too overpowered at U though.

[A_Outcast]

Well the second one trumps the first one in every way.  It's way too overpowered at U though.

I completely agree with your first statement, not too much with your second.  so many spells have had split second put onto them for the low low cost of (krosan grip vs naturalize, trickbind vs stifle).  its like a psuedy-quicken, but with split second instead of flash.  Its like a pre-emptive counterspell.  But what if they DONT have a counter?  then you just wasted a spell.  Seems really strong, but i wouldn't call it overpowered though.

[Matt]

Cute, but referring to the first one, what if the spell doesn't resolve? I'm thinking of a spell with no legal targets.

I guess you could write it as, "move target spell to the top of the stack (It resolves first.)" but that's horrifically ugly. what about:

Rearrange the order of all spells and abilities on the stack.

That actually makes it a better card, too! I wonder if there's a way to word it without using the phrase, "the stack".

[DubDub]

Cute, but referring to the first one, what if the spell doesn't resolve? I'm thinking of a spell with no legal targets.

I guess you could write it as, "move target spell to the top of the stack (It resolves first.)" but that's horrifically ugly. what about:

Rearrange the order of all spells and abilities on the stack.

That actually makes it a better card, too! I wonder if there's a way to word it without using the phrase, "the stack".

What about:
"Exile target spell you control, you may play that spell without paying it's mana cost.  If the spell previously had targets then it retains those targets, otherwise you may choose new targets."
The problem here is that it must be limited to spells you control, or it becomes the best counterspell of all time (except for Force and Drain of course), and that it doesn't help you with additional costs (using this on Tinker would require an additional sacrifice).  The 'targets' language is also a little loose.  I'm not sure this version is any stronger than Dispel.

[A_Outcast]

A way prioritize could work with added utility would be as a trap.

Prioritize - 
Instant
If Prioritize is targeting a spell you controle you may pay instead of it's casting cost.
Copy target spell, you control this copy.  If the spell had any targets, the copy has the same targets.  Then exile the original spell.
Some things are more important than others.

It gives it some more utility (say copying a tinker) but also forces the original spell to resolve in a tricky way.

[Cyberpunker]

The first one is pretty good. The 2nd one is way too broken, basically a split second Vexing Shusher effect.

[DubDub]

A way prioritize could work with added utility would be as a trap.

Prioritize - 
Instant
If Prioritize is targeting a spell you controle you may pay instead of it's casting cost.
Copy target spell, you control this copy.  If the spell had any targets, the copy has the same targets.  Then exile the original spell.
Some things are more important than others.

It gives it some more utility (say copying a tinker) but also forces the original spell to resolve in a tricky way.

The problem there is that you've printed a strictly better Spelljack even at full price.  If your opponent plays Fact or Fiction and you Prioritize it then you get to Fact, and they don't (plus their Fact gets exiled, not sent to their graveyard).
What about "that spell's controller controls this copy."

Also, I'm not sure if the timing for your trap cost works.  Does one announce targets before paying costs?  Rigorously I mean?  I think you do, since Wasteland 'can target itself'.  Do you announce targets before determining costs though?

[FlyFlySideOfFry]

What about "target spell attempts to resolve"? Would that wording be too sketchy?