The Blood-Shifter, Drakonosios

Drakonosios Emerge(To play this creature, you must sacrifice a Drakonosios Legendary Creature), Life Cost(you must pay at least 10 life to play this creature), Trample, Haste, Flying,
The Blood-Shifter, Drakonosios's power and toughness are equal to 4 times the amount of life paid to play The Blood-Shifter, Drakonosios