Historical Rules · 10 August 2018
Rule 311.7
Official source text from the 10 August 2018 Rules release
Each vanguard card has a life modifier printed in its lower right corner. This is a number preceded by a plus sign, a number preceded by a minus sign, or a zero. This modifier is applied as the starting life total of the vanguard card’s owner (normally 20) to is determined. See rule 103.3.