Yarvi, Half a King

When Yarvi, Half a King enters the battlefield tap all creatures.
{p/w}{t} Put a vow counter on target creature.
{w}{3} Yarvi, Half a King gains power and toughness equal to that creature's converted mana cost.
When Yarvi, Half a King dies you gain X life where X is Yarvi's total toughness.
"Maybe I am half a man but I can keep my vow"
______Yarvi