Slithery Stalker

Target player discards a card. Draw a card.

Add BBB. Threshold — Add BBBBB instead if there are seven or more cards in your graveyard.

T: Add C. T: Add B or G. Activate only if you control a Swamp.

Flying When this creature enters, target player loses 3 life. When this creature leaves the battlefield, that player gains 3 life.

Until end of turn, if target player would draw a card, instead that player skips that draw and you draw a card.

Draw four cards, then choose X cards in your hand and discard the rest.

First strike Threshold — As long as there are seven or more cards in your graveyard, this creature gets +1/+1, is black, and has "2B, T: Destroy target red creature."

Whenever a permanent other than this enchantment is put into a graveyard from the battlefield, this enchantment deals 1 damage to each creature and each player. When no creatures are on the battlefield, sacrifice this enchantment.