Avalier, The Pre-Lich Warlock

Lifesteal
Trample
Once Avalier, The Pre-Lich Warlock enters the battle put 3 phylactery counters on three cards of your choice, when all three of those cards are sent to the graveyard destroy this card, until this card has 0 phylactery counters left on the field this card is indestructible.
When this card has killed 3 monsters, or done 15 damage to an opponent flip this card.