| 2/1/2007 |
In the Two-Headed Giant format, you still only have to pay once per creature. |
| 10/1/2008 |
This has the supertype world. When a world permanent enters, any world permanents that were already on the battlefield are put into their owners' graveyards. This is a state-based action called the "world rule." The new world permanent stays on the battlefield. If two world permanents enter at the same time, they're both put into their owners' graveyards. |
| 2/1/2014 |
Unless some effect explicitly says otherwise, a creature that can't attack you can still attack a planeswalker you control. |
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