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'When this creature enters, creatures your opponents control get -2/-2 until end of turn.
Whenever a creature an opponent controls dies, that player loses 2 life.
'This creature gets +0/+1 as long as an opponent controls an Island.
'Defender, trample
When this creature blocks, it loses defender.
'When this creature enters, flip a coin. If you lose the flip, return this creature to its owner's hand.
'Whenever this creature attacks, destroy all other creatures.
'Undergrowth — When this creature enters, target creature gains vigilance and gets +X/+X until end of turn, where X is the number of creature cards in your graveyard. This creature...
'Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
'Buyback {2}{G} (You may pay an additional {2}{G} as you cast this spell. If you do, put this card into your hand as it resolves.) Create an X/X green Wurm...
'Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
Indestructible
'Boneyard Wurm's power and toughness are each equal to the number of creature cards in your graveyard.