Ok, if my opponent have at least two creatures and an unattached equip at the battlefield and I have at least one creature, when he tries to equip one of his creatures I cast Reroute...
May I try to equip my own creature? Do I have to equip his other creature? If he has only one creature may I cast the spell? Could you tell me which rule covers this scenarios?
Ok, if my opponent have at least two creatures and an unattached equip at the battlefield and I have at least one creature, when he tries to equip one of his creatures I cast Reroute...
May I try to equip my own creature?
No. When changing the target, the new target must be legal. So you must choose one of his creatures because Equip is "Attach this Equipment to target creature you control," and he still controls the activated ability, even if you are changing the target. FUN FACT: You can change the target to one of his creatures with hexproof, because it's his ability you're changing the target of and your spell (Reroute) doesn't target that creature.
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Do I have to equip his other creature?
I'm 87% sure the answer to this is yes. The instruction is to change the target of an activated ability with a single target, so if the target can be changed it must be changed. If it was worded instead "You may change the target of target activated ability with a single target," then I would say no. But that's not the case here.
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If he has only one creature may I cast the spell?
Yes. The spell only wants you to target an activated ability with a single target. Which you can do. When it resolves, it does as much as it can. Since you can't change the target of the ability, you skip that part and go straight to the cantrip.
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Could you tell me which rule covers this scenarios?
Not off the top of my head. I am not so much of a machine that I have memorized the entire Comp Rules. I'll edit with quotes if and when I find them.
Comp Rules
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101.3. Any part of an instruction that’s impossible to perform is ignored. (In many cases the card will specify consequences for this; if it doesn’t, there’s no effect.)
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114.6. Some effects allow a player to change the target(s) of a spell or ability, and other effects allow a player to choose new targets for a spell or ability. 114.6a If an effect allows a player to “change the target(s)” of a spell or ability, each target can be changed only to another legal target. If a target can’t be changed to another legal target, the original target is unchanged, even if the original target is itself illegal by then. If all the targets aren’t changed to other legal targets, none of them are changed. 114.6b If an effect allows a player to “change a target” of a spell or ability, the process described in rule 114.6a is followed, except that only one of those targets may be changed (rather than all of them or none of them). 114.6c If an effect allows a player to “change any targets” of a spell or ability, the process described in rule 114.6a is followed, except that any number of those targets may be changed (rather than all of them or none of them). 114.6d If an effect allows a player to “choose new targets” for a spell or ability, the player may leave any number of the targets unchanged, even if those targets would be illegal. If the player chooses to change some or all of the targets, the new targets must be legal and must not cause any unchanged targets to become illegal. 114.6e When changing targets or choosing new targets for a spell or ability, only the final set of targets is evaluated to determine whether the change is legal. Example: Arc Trail is a sorcery that reads “Arc Trail deals 2 damage to target creature or player and 1 damage to another target creature or player.” The current targets of Arc Trail are Runeclaw Bear and Llanowar Elves, in that order. You cast Redirect, an instant that reads “You may choose new targets for target spell,” targeting Arc Trail. You can change the first target to Llanowar Elves and change the second target to Runeclaw Bear.
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702.6a Equip is an activated ability of Equipment cards. “Equip [cost]” means “[Cost]: Attach this permanent to target creature you control. Activate this ability only any time you could cast a sorcery.”
A spell or ability's effect is only optional if the text indicates it is optional by using "may". Reroute's Oracle text does not do that, so you are obligated to choose a new target, if a new legal target is available. To offer a parallel example, would you expect that you have the option of not countering the targeted spell when your Cancel resolves?
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