Wurm Wrath

Target attacking Wurm creature you control gets
+5/+0 until end of turn. If that creature would
die this turn, it doesn't. Instead, tap it. Then,
until the end of defending player's next turn, creatures he or she controls get -2/-0.
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"Is that...? Oh no. Run! Run! For god's sake, run!"
- Kirian Folksen, last words