Beseech Yynnox

For each {b/g} in Beseech Yynnox's mana cost,
you may instead pay {2}.
Target opponent loses 3 life if {b} was spent to
cast Beseech Yynnox. You gain 3 life if {g} was
spent to cast Beseech Yynnox. (Do both if {b}{g} was spent.)
If {b}{b}{b} was spent, instead that player loses 4
life. If {g}{g}{g} was spent, instead you gain 4 life.
(Do both if {b}{b}{b}{g}{g}{g} was spent.)