Flying (This creature can't be blocked except by creatures with flying or reach.), trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
At the beginning of your upkeep, sacrifice a creature other than Xathrid Demon, then each opponent loses life equal to the sacrificed creature's power. If you can't sacrifice a creature, tap Xathrid Demon and you lose 7 life.
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