| 4/1/2008 |
Since the activated ability doesn't have a tap symbol in its cost, you can tap creatures (including Sigil Tracer itself) that haven't been under your control since your most recent turn began to pay the cost. |
| 4/1/2008 |
If the spell is modal (that is, it says "choose one —" or "choose two —"), the choice of mode(s) can't be changed. |
| 4/1/2008 |
Sigil Tracer's ability can copy an instant or sorcery spell that isn't targeted. |
| 4/1/2008 |
If the controller of the original spell chose to pay an alternative cost (such as prowl) or an additional cost, that choice is also copied. |
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