Arolias, Wyvernhunter

Ward {x}, where X is the number of blood counters
on Arolias, Wyvernhunter.

{b}{1}, Sacrifice a Dragon: Gain life equal to its toughness, then draw 1 card and put a blood counter
on Arolias, Wyvernhunter.

{t}, Remove 3 blood counters from Arolias, Wyvernhunter: Exile it, then return it to the battlefield transformed.