Rillan, The Generous Blade

When Rillan, The Generous Blade
Attacks you may discard a card,
Rillan, The generous Blade gets +x/+x equal to the discared card's mana cost. If a creature blocking Rillan ,The Generous Blade died exhile that creature and create a 1/1 Specter creature token.
{w}{r}{t} target creature gains a choice of vigilance,haste, or first strike until end of turn.