this.color.setBlack(true);
this.power = new MageInt(4);
this.toughness = new MageInt(5);
// Delve
this.addAbility(new DelveAbility());
// Flying
this.addAbility(FlyingAbility.getInstance());
// {X}, {T}, Exile X cards from your graveyard: Target creature gets -X/-X until end of turn.
DynamicValue xValue = new SignInversionDynamicValue(new ManacostVariableValue());
Effect effect = new BoostTargetEffect(xValue,xValue,Duration.EndOfTurn);