Nothing warms the bark on a chilly day like a draught of elf.

Eventide

Cankerous Thirst

If {B} was spent to play Cankerous Thirst, you may have target creature get -3/-3 until end of turn. If {G} was spent to play Cankerous Thirst, you may have target creature get +3/+3 until end of turn. (Do both if {B}{G} was spent.)

If {B} was spent to cast this spell, you may have target creature get -3/-3 until end of turn. If {G} was spent to cast this spell, you may have target creature get +3/+3 until end of turn. (Do both if {B}{G} was spent.)