Two abilities on one spell?

I'm making a summoning spell, and I got the summoning part done right but because the summoned unit is fairly powerful I wanted to add a spell and mana drain on the caster as long as the summoned unit exists. I've tried adding the ability Life & Mana Drain (Caster) to the spell but it doesn't work. Tried scripting the damage to life and mana but couldn't find a command to do it. Tried creating an item that automatically used (complete with aura effect icon) but didn't know how to manage it. Any help appreciated.

Well, I'd be tempted to create an ability based off of Item Mana Regeneration, since it has no icon and allows you to pretty much do exactly what you want, with a negative value.

You'd add the mana-draining ability to the unit when the summon is made, and remove it if the unit goes below a certain amount of mana. This will require you to track the unit and summon in variables, and you may need to make a "Specific" unit event to have something happen when the unit's mana gets low, but it's doable.

yeah there is a way to do this, you gotta make a specific command for it and trig all commands under it to make this happen