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This is pretty useful when you have creatures with strong attack triggers but lack haste, like Etali, Primal Storm

Mortify will basically never be dead and it will give you a whole added bit of security over something like a Doom Blade

Flipping a permanent is a one-way process

5 | Mai, Scornful Striker Mai, Scornful Striker is highly reminiscent of Eidolon of the Great Revel, a powerhouse hate card from the past

Lorwyns (2007) Card not found is a bit on the expensive side for this effect, but it also clashes, which means you might be able to use it again

Once the ability resolves, the bonus doesn't change if that number changes later in the turn