After some thought, I figured Incantations would probably be best as not a new card type, but just instants with an additional line of game text:
"THIS can only be played during an opponent's/allie's turn."
The problem being...which to do? Either-or, both?
The way I figure it, (again after some thought) is that it should be either-or, depending on the card. The above examples would be nice limited to opponent's turns. Then again, here are some neat-o examples:
How Dare You
U
Instant
How Dare You can only be played during an allie's turn.
Counter target spell. Draw a card.
(Nice card for saving your teammate's butt, but useless in every other situation. And because of that, able to be a cheap cantrip. Maybe too powerful for team formats, though, but I doubt it with the allie only restriction.)
Sifting Terrain
G
Instant
Sifting Terrain can only be played during an opponent's turn.
Each player may look through his or her library for a basic land and put it into play. That player shuffles his or her deck afterward.
(A nice fetch spell that does not suffer the "comes into play tapped" clause...but because it helps your opponent more than you)
Time Weaving
UUU
Instant
Time Weaving can only be played during an opponent's or allie's turn.
The player who's turn it is takes an additional turn after this one.
(A heavy commitment to blue is needed, but an extra turn can be had for 3 mana. Who would use this on an opponent? I dunno...seems fun to think it could be used that way for kooky combos.)
btw--should this all become a separate thread because of it's off-topic-ness?
