gamble

flip a coin if in your favour:roll a 20 sided die,
choose one:
•you gain {x} life.
• target creature gains +{x}/+{x} until end of turn.
•create {x} vampire 1/1 tokens with lifelink.
if not in your favour, target opponent, roll a 20
sided die, choose 1:
{bull}he/she gains {x} life.
{bull} target creature gains +{x}/+{x} until end of turn.
{bull}create {x} vampire 1/1 tokens with lifelink.