Fenrir Maugrim

Double strike, menace
When Fenrir Maugrim enters the battlefield, if {w} was spent to cast it, creatures you control get double strike until end of turn. Creatures you control get menace until end of turn if {b} was spent to cast it. (Do both if {w}{b} was spent.)
{r}: Fenrir Maugrim gets +2/+0 until end of turn. Activate this ability only once each turn.