Chosen Undead, Darksign Lord

Whenever Chosen Undead kills a creature with combat damage, Put X Soul counters on Chosen Undead, where X is the toughness of the killed creature.

Remove a Soul counter from Chosen Undead and choose one:
• Put a +0/+1 counter on Chosen Undead.
• Put a +1/+0 counter on Chosen Undead.
• Add {b}to your mana pool and lose 1 life.